Version bump

- Issue an error when --build is used together with --make
- When given --build, always use GNU Make to perform the build
- Update documentation (examples were good as they were)
- Remove the broken t_flag_build_cmake test

Fixes #2280

.clang-format

@@ -0,0 +1,111 @@
+---
+Language:        Cpp
+# BasedOnStyle:  LLVM
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: DontAlign
+AlignOperands:   true
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: true
+AllowShortCaseLabelsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: true
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: false
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:   
+  AfterClass:      false
+  AfterControlStatement: false
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  AfterExternBlock: false
+  BeforeCatch:     false
+  BeforeElse:      false
+  IndentBraces:    false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: All
+BreakBeforeBraces: Attach
+BreakBeforeInheritanceComma: false
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeComma
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: true
+ColumnLimit:     99
+CommentPragmas:  '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+ForEachMacros:   
+  - foreach
+  - Q_FOREACH
+  - BOOST_FOREACH
+IncludeBlocks:   Preserve
+IncludeCategories: 
+  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
+    Priority:        2
+  - Regex:           '^(<|"(gtest|gmock|isl|json)/)'
+    Priority:        3
+  - Regex:           '.*'
+    Priority:        1
+IncludeIsMainRegex: '(Test)?$'
+IndentCaseLabels: false
+IndentPPDirectives: None
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakAssignment: 2
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    false
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 2
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Cpp03
+TabWidth:        8
+UseTab:          Never
+...
+

.clang-tidy

@@ -2,7 +2,7 @@ Checks:          'clang-diagnostic-*,clang-analyzer-*,*,-modernize*,-hicpp*,-and
 WarningsAsErrors: ''
 HeaderFilterRegex: ''
 FormatStyle:     none
-CheckOptions:    
+CheckOptions:
   - key:             google-readability-braces-around-statements.ShortStatementLines
     value:           '2'
   - key:             google-readability-namespace-comments.SpacesBeforeComments

.codacy.yml

@@ -0,0 +1,5 @@
+---
+exclude_paths:
+  - '.github/**'
+  - 'ci/build_verilator.sh'
+  - 'include/vltstd/**'

.gitattributes

@@ -0,0 +1,4 @@
+*.v linguist-language=SystemVerilog
+*.vh linguist-language=SystemVerilog
+*.sv linguist-language=SystemVerilog
+nodist linguist-detectable=false

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,16 @@
+---
+name: Bug report
+about: Something isn't working as expected, and it isn't "Unsupported." (Note our contributor agreement at https://github.com/verilator/verilator/.github/blob/master/CONTRIBUTING.adoc)
+title: ''
+labels: new
+assignees: ''
+
+---
+
+Thanks for taking the time to report this.
+
+Can you attach an example that shows the issue?  (Must be openly licensed, ideally in test_regress format.)
+
+What 'verilator --version' are you using?  Did you try it with the git master version?
+
+Would you be willing to try to fix Verilator yourself with assistance?

.github/ISSUE_TEMPLATE/feature.md

@@ -0,0 +1,16 @@
+---
+name: Feature Request
+about: Request something should be supported, or a new feature added. (Note our contributor agreement at https://github.com/verilator/verilator/.github/blob/master/CONTRIBUTING.adoc)
+title: ''
+labels: new
+assignees: ''
+
+---
+
+Thanks for taking the time to report this.
+
+What would you like added/supported?
+
+Can you attach an example that runs on other simulators?  (Must be openly licensed, ideally in test_regress format.)
+
+May we assist you in trying to fix this yourself?

.github/ISSUE_TEMPLATE/questions.md

@@ -0,0 +1,10 @@
+---
+name: Q and A, or Other
+about: Ask a question, not related to a specific bug or feature request. (Note our contributor agreement at https://github.com/verilator/verilator/.github/blob/master/CONTRIBUTING.adoc)
+title: ''
+labels: new
+assignees: ''
+
+---
+
+How may we help - what is your question?

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1 @@
+We appreciate your contributing to Verilator.  If this is your first commit, please add your name to docs/CONTRIBUTORS, and read our contributing guidelines in docs/CONTRIBUTING.adoc.

.github/labels.toml

@@ -0,0 +1,199 @@
+["area: assertions"]
+color = "ffffe8"
+name = "area: assertions"
+description = "Issue involves assertions"
+
+["area: configure/compiling"]
+color = "ffffe8"
+name = "area: configure/compiling"
+description = "Issue involves configuring or compilating Verilator itself"
+
+["area: coverage"]
+color = "ffffe8"
+name = "area: coverage"
+description = "Issue involves coverage generation"
+
+["area: data-types"]
+color = "ffffe8"
+name = "area: data-types"
+description = "Issue involves data-types"
+
+["area: documentation"]
+color = "ffffe8"
+name = "area: documentation"
+description = "Issue involves documentation"
+
+["area: elaboration"]
+color = "ffffe8"
+name = "area: elaboration"
+description = "Issue involves elaboration phase"
+
+["area: invoking/options"]
+color = "ffffe8"
+name = "area: invoking/options"
+description = "Issue involves options passed to Verilator"
+
+["area: lint"]
+color = "ffffe8"
+name = "area: lint"
+description = "Issue involves SystemVerilog lint checking"
+
+["area: parser"]
+color = "ffffe8"
+name = "area: parser"
+description = "Issue involves SystemVerilog parsing"
+
+["area: performance"]
+color = "ffffe8"
+name = "area: performance"
+description = "Issue involves performance issues"
+
+["area: portability"]
+color = "ffffe8"
+name = "area: portability"
+description = "Issue involves operating system/compiler portability"
+
+["area: runtime result"]
+color = "ffffe8"
+name = "area: runtime result"
+description = "Issue involves an incorrect runtine result from Verilated model"
+
+["area: scheduling"]
+color = "ffffe8"
+name = "area: scheduling"
+description = "Issue involves scheduling/ordering of events"
+
+["area: tests"]
+color = "ffffe8"
+name = "area: tests"
+description = "Issue involves the testing system"
+
+["area: usability"]
+color = "ffffe8"
+name = "area: usability"
+description = "Issue involves general usability"
+
+["effort: days"]
+color = "d0c0b0"
+name = "effort: days"
+description = "Expect this issue to require roughly days of invested effort to resolve"
+
+["effort: hours"]
+color = "f5e6d6"
+name = "effort: hours"
+description = "Expect this issue to require roughly hours of invested effort to resolve"
+
+["effort: minutes"]
+color = "f5e6d6"
+name = "effort: minutes"
+description = "Expect this issue to require less than an hour of invested effort to resolve"
+
+["effort: weeks"]
+color = "d0c0b0"
+name = "effort: weeks"
+description = "Expect this issue to require weeks or more of invested effort to resolve"
+
+["good first issue"]
+color = "7057ff"
+name = "good first issue"
+description = "Good for newcomers"
+
+["help wanted"]
+color = "008672"
+name = "help wanted"
+description = "Extra attention is needed"
+
+["new"]
+color = "ff4400"
+name = "new"
+description = "New issue, not yet seen by maintainers"
+
+["resolution: abandoned"]
+color = "cfd3d7"
+name = "resolution: abandoned"
+description = "Closed; not enough information or otherwise never finished"
+
+["resolution: answered"]
+color = "cfd3d7"
+name = "resolution: answered"
+description = "Closed; only applies to questions which were answered"
+
+["resolution: duplicate"]
+color = "cfd3d7"
+name = "resolution: duplicate"
+description = "Closed; issue or pull request already exists"
+
+["resolution: external"]
+color = "cfd3d7"
+name = "resolution: external"
+description = "Closed; passed to another tool's bug tracker"
+
+["resolution: fixed"]
+color = "cfd3d7"
+name = "resolution: fixed"
+description = "Closed; fixed"
+
+["resolution: invalid"]
+color = "cfd3d7"
+name = "resolution: invalid"
+description = "Closed; issue or pull request is no longer relevant"
+
+["resolution: no fix needed"]
+color = "cfd3d7"
+name = "resolution: no fix needed"
+description = "Closed; no fix required (not a bug)"
+
+["resolution: wontfix"]
+color = "cfd3d7"
+name = "resolution: wontfix"
+description = "Closed; work won't continue on an issue or pull request"
+
+["status: asked reporter"]
+color = "ffffff"
+name = "status: asked reporter"
+description = "Bug is waiting for reporter to answer a question"
+
+["status: assigned"]
+color = "a0f0ff"
+name = "status: assigned"
+description = "Issue is assigned to someone to work on"
+
+["status: blocked"]
+color = "00007f"
+name = "status: blocked"
+description = "Issue is waiting for another bug, when other bug is fixed, then goes to 'status: assigned'"
+
+["status: discussion"]
+color = "d876e3"
+name = "status: discussion"
+description = "Issue is waiting for discussions to resolve"
+
+["status: ready"]
+color = "b6c92a"
+name = "status: ready"
+description = "Issue is ready for someone to fix; then goes to 'status: assigned'"
+
+["type: bug"]
+color = "d73a4a"
+name = "type: bug"
+description = "Defect"
+
+["type: feature-IEEE"]
+color = "cfccff"
+name = "type: feature-IEEE"
+description = "Request to add new feature, described in IEEE 1800"
+
+["type: feature-non-IEEE"]
+color = "cfccff"
+name = "type: feature-non-IEEE"
+description = "Request to add new feature, outside IEEE 1800"
+
+["type: maintenance"]
+color = "cfccff"
+name = "type: maintenance"
+description = "Internal maintenance task"
+
+["type: q and a"]
+color = "84ba34"
+name = "type: q and a"
+description = "Question and answer about some feature or user question"

.gitignore

@@ -17,6 +17,7 @@
 README
 TAGS
 autom4te.cache
+compile_commands.json
 config.cache
 config.status
 configure
@@ -30,4 +31,6 @@ verilator.txt
 verilator_bin*
 verilator_coverage_bin*
 verilator.pc
+verilator-config.cmake
+verilator-config-version.cmake
 **/obj_dir/*

.travis.yml

@@ -0,0 +1,187 @@
+# DESCRIPTION: Travis-CI config
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+version: ~> 1.0
+
+os: linux
+language: cpp
+cache: ccache
+
+env:
+  global:
+    - VERILATOR_CACHE=$HOME/verilator_cache
+    - VERILATOR_ROOT=$PWD
+    - VERILATOR_NUM_JOBS=$(echo `nproc` + 1 | bc)
+    - VERILATOR_CONFIG_FLAGS="--enable-maintainer-mode --enable-longtests"
+    - VERILATOR_AUTHOR_SITE=1
+
+cache:
+  directories:
+    - $VERILATOR_CACHE
+
+before_install:
+# Perl modules needed for testing
+# Not listing Bit::Vector as slow to install, and only skips one test
+  - touch temp.cpp ; g++ -E -dM -c temp.cpp | sort ; rm -rf temp.cpp
+  - yes yes | sudo cpan -fi Unix::Processors Parallel::Forker
+  - sudo apt-get install gdb gtkwave
+  - sudo apt-get install libgoogle-perftools-dev
+before_script:
+  - bash -x ci/build_vcddiff.sh
+  - bash -x ci/build_verilator.sh
+after_script:
+  - ccache -s
+
+stages:
+  - "Build Verilator"
+  - test
+
+jobs:
+  include:
+    - if: type != cron
+      stage: "Build Verilator"
+      name: Build Verilator
+      compiler: gcc
+      script: echo "Done building Verilator"
+# Non-cron build will just run on whatever linux flavor we get
+    - if: type != cron
+      stage: test
+      name: Dist test
+      compiler: gcc
+      script: ci/test.sh dist
+    - if: type != cron
+      stage: test
+      name: Vlt test
+      compiler: gcc
+      script: ci/test.sh vlt
+    - if: type != cron
+      stage: test
+      name: Vltmt set 0 test
+      compiler: gcc
+      script: ci/test.sh vltmt0
+    - if: type != cron
+      stage: test
+      name: Vltmt set 1 test
+      compiler: gcc
+      script: ci/test.sh vltmt1
+# Cron builds try different OS/compiler combinations
+    - if: type = cron
+      stage: "Build Verilator"
+      name: Build xenial gcc Verilator
+      os: linux
+      dist: xenial
+      compiler: gcc
+      script: echo "Done building Verilator"
+    - if: type = cron
+      stage: test
+      name: Xenial gcc dist test
+      os: linux
+      dist: xenial
+      compiler: gcc
+      script: ci/test.sh dist
+    - if: type = cron
+      stage: test
+      name: Xenial gcc vlt test
+      os: linux
+      dist: xenial
+      compiler: gcc
+      script: ci/test.sh vlt
+    - if: type = cron
+      stage: test
+      name: Xenial gcc vltmt test
+      os: linux
+      dist: xenial
+      compiler: gcc
+      script: ci/test.sh vltmt
+    - if: type = cron
+      stage: "Build Verilator"
+      name: Build xenial clang Verilator
+      os: linux
+      dist: xenial
+      compiler: clang
+      script: echo "Done building Verilator"
+    - if: type = cron
+      stage: test
+      name: Xenial clang dist test
+      os: linux
+      dist: xenial
+      compiler: clang
+      script: ci/test.sh dist
+    - if: type = cron
+      stage: test
+      name: Xenial clang vlt test
+      os: linux
+      dist: xenial
+      compiler: clang
+      script: ci/test.sh vlt
+    - if: type = cron
+      stage: test
+      name: Xenial clang vltmt test
+      os: linux
+      dist: xenial
+      compiler: clang
+      script: ci/test.sh vltmt
+#    - if: type = cron
+#      stage: "Build Verilator"
+#      name: Build OSX gcc Verilator
+#      os: osx
+#      compiler: gcc
+#      script: echo "Done building Verilator"
+#    - if: type = cron
+#      stage: test
+#      name: OSX gcc dist test
+#      os: osx
+#      compiler: gcc
+#      script: ci/test.sh dist
+#    - if: type = cron
+#      stage: test
+#      name: OSX gcc vlt test
+#      os: osx
+#      compiler: gcc
+#      script: ci/test.sh vlt
+#    - if: type = cron
+#      stage: test
+#      name: OSX gcc vltmt test
+#      os: osx
+#      compiler: gcc
+#      script: ci/test.sh vltmt
+    - if: type = cron
+      stage: "Build Verilator"
+      name: Build trusty gcc Verilator
+      os: linux
+      dist: trusty
+      compiler: gcc
+      script: echo "Done building Verilator"
+    - if: type = cron
+      stage: test
+      name: Trusty gcc dist test
+      os: linux
+      dist: trusty
+      compiler: gcc
+      script: ci/test.sh dist
+    - if: type = cron
+      stage: test
+      name: Trusty gcc vlt test
+      os: linux
+      dist: trusty
+      compiler: gcc
+      script: ci/test.sh vlt
+    - if: type = cron
+      stage: test
+      os: linux
+      dist: trusty
+      name: Trusty gcc vltmt test
+      compiler: gcc
+      script: ci/test.sh vltmt
+
+notifications:
+  email:
+    if: repo = verilator/verilator
+    recipients:
+      - [email protected]
+      - [email protected]

COPYING

@@ -1,674 +0,0 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
-
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The GNU General Public License is a free, copyleft license for
-software and other kinds of works.
-
-  The licenses for most software and other practical works are designed
-to take away your freedom to share and change the works.  By contrast,
-the GNU General Public License is intended to guarantee your freedom to
-share and change all versions of a program--to make sure it remains free
-software for all its users.  We, the Free Software Foundation, use the
-GNU General Public License for most of our software; it applies also to
-any other work released this way by its authors.  You can apply it to
-your programs, too.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-them if you wish), that you receive source code or can get it if you
-want it, that you can change the software or use pieces of it in new
-free programs, and that you know you can do these things.
-
-  To protect your rights, we need to prevent others from denying you
-these rights or asking you to surrender the rights.  Therefore, you have
-certain responsibilities if you distribute copies of the software, or if
-you modify it: responsibilities to respect the freedom of others.
-
-  For example, if you distribute copies of such a program, whether
-gratis or for a fee, you must pass on to the recipients the same
-freedoms that you received.  You must make sure that they, too, receive
-or can get the source code.  And you must show them these terms so they
-know their rights.
-
-  Developers that use the GNU GPL protect your rights with two steps:
-(1) assert copyright on the software, and (2) offer you this License
-giving you legal permission to copy, distribute and/or modify it.
-
-  For the developers' and authors' protection, the GPL clearly explains
-that there is no warranty for this free software.  For both users' and
-authors' sake, the GPL requires that modified versions be marked as
-changed, so that their problems will not be attributed erroneously to
-authors of previous versions.
-
-  Some devices are designed to deny users access to install or run
-modified versions of the software inside them, although the manufacturer
-can do so.  This is fundamentally incompatible with the aim of
-protecting users' freedom to change the software.  The systematic
-pattern of such abuse occurs in the area of products for individuals to
-use, which is precisely where it is most unacceptable.  Therefore, we
-have designed this version of the GPL to prohibit the practice for those
-products.  If such problems arise substantially in other domains, we
-stand ready to extend this provision to those domains in future versions
-of the GPL, as needed to protect the freedom of users.
-
-  Finally, every program is threatened constantly by software patents.
-States should not allow patents to restrict development and use of
-software on general-purpose computers, but in those that do, we wish to
-avoid the special danger that patents applied to a free program could
-make it effectively proprietary.  To prevent this, the GPL assures that
-patents cannot be used to render the program non-free.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.
-
-                       TERMS AND CONDITIONS
-
-  0. Definitions.
-
-  "This License" refers to version 3 of the GNU General Public License.
-
-  "Copyright" also means copyright-like laws that apply to other kinds of
-works, such as semiconductor masks.
-
-  "The Program" refers to any copyrightable work licensed under this
-License.  Each licensee is addressed as "you".  "Licensees" and
-"recipients" may be individuals or organizations.
-
-  To "modify" a work means to copy from or adapt all or part of the work
-in a fashion requiring copyright permission, other than the making of an
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-earlier work or a work "based on" the earlier work.
-
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-on the Program.
-
-  To "propagate" a work means to do anything with it that, without
-permission, would make you directly or secondarily liable for
-infringement under applicable copyright law, except executing it on a
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-public, and in some countries other activities as well.
-
-  To "convey" a work means any kind of propagation that enables other
-parties to make or receive copies.  Mere interaction with a user through
-a computer network, with no transfer of a copy, is not conveying.
-
-  An interactive user interface displays "Appropriate Legal Notices"
-to the extent that it includes a convenient and prominently visible
-feature that (1) displays an appropriate copyright notice, and (2)
-tells the user that there is no warranty for the work (except to the
-extent that warranties are provided), that licensees may convey the
-work under this License, and how to view a copy of this License.  If
-the interface presents a list of user commands or options, such as a
-menu, a prominent item in the list meets this criterion.
-
-  1. Source Code.
-
-  The "source code" for a work means the preferred form of the work
-for making modifications to it.  "Object code" means any non-source
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-is widely used among developers working in that language.
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-  The "System Libraries" of an executable work include anything, other
-than the work as a whole, that (a) is included in the normal form of
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-"Major Component", in this context, means a major essential component
-(kernel, window system, and so on) of the specific operating system
-(if any) on which the executable work runs, or a compiler used to
-produce the work, or an object code interpreter used to run it.
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-  The "Corresponding Source" for a work in object code form means all
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-programs which are used unmodified in performing those activities but
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-includes interface definition files associated with source files for
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-linked subprograms that the work is specifically designed to require,
-such as by intimate data communication or control flow between those
-subprograms and other parts of the work.
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-  The Corresponding Source need not include anything that users
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-Source.
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-  The Corresponding Source for a work in source code form is that
-same work.
-
-  2. Basic Permissions.
-
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-  "Additional permissions" are terms that supplement the terms of this
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-(including a cross-claim or counterclaim in a lawsuit) alleging that
-any patent claim is infringed by making, using, selling, offering for
-sale, or importing the Program or any portion of it.
-
-  11. Patents.
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-  A "contributor" is a copyright holder who authorizes use under this
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-work thus licensed is called the contributor's "contributor version".
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-(such as an express permission to practice a patent or covenant not to
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-actual knowledge that, but for the patent license, your conveying the
-covered work in a country, or your recipient's use of the covered work
-in a country, would infringe one or more identifiable patents in that
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-arrangement, you convey, or propagate by procuring conveyance of, a
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-  A patent license is "discriminatory" if it does not include within
-the scope of its coverage, prohibits the exercise of, or is
-conditioned on the non-exercise of one or more of the rights that are
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-or that patent license was granted, prior to 28 March 2007.
-
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-  12. No Surrender of Others' Freedom.
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-  If conditions are imposed on you (whether by court order, agreement or
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-the Program, the only way you could satisfy both those terms and this
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-  13. Use with the GNU Affero General Public License.
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-combination as such.
-
-  14. Revised Versions of this License.
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-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
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-possible use to the public, the best way to achieve this is to make it
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-
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-    Copyright (C) <year>  <name of author>
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-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-  If the program does terminal interaction, make it output a short
-notice like this when it starts in an interactive mode:
-
-    <program>  Copyright (C) <year>  <name of author>
-    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, your program's commands
-might be different; for a GUI interface, you would use an "about box".
-
-  You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
-
-  The GNU General Public License does not permit incorporating your program
-into proprietary programs.  If your program is a subroutine library, you
-may consider it more useful to permit linking proprietary applications with
-the library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.

LICENSE

@@ -1,7 +1,7 @@
                    GNU LESSER GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 

MANIFEST.SKIP

@@ -1,5 +1,8 @@
+\.clang-format
 \.clang-tidy
 \.git/
+\.git$
+\.github/
 \.svn/
 \.(bak|old)/
 \.(bak|old)$
@@ -13,20 +16,31 @@
 .*\.key
 .*\.vcd
 .*\.1
-/obj_dir/
+\.codacy\.yml
+\.travis\.yml
+/build/
 /obj_dbg/
+/obj_dir/
+/obj_dist/
+/obj_iv/
 /obj_nc/
 /obj_opt/
 /obj_vcs/
 /obj_vlt/
 /obj_vltmt/
-/obj_dist/
-/INCA_libs/
+INCA_libs/
 /cov_work/
 /logs/
 ^Makefile$
+README.html
 bin/verilator_bin.*
 bin/verilator_coverage_bin.*
+docs/.*\.html$
+docs/Makefile$
+docs/clang-format.txt$
+docs/doxygen-doc/.*
+examples/xml_py/copied/
+examples/xml_py/graph.*
 src/Makefile$
 src/Makefile_obj$
 include/verilated.mk$
@@ -35,6 +49,8 @@ config.cache$
 config.status$
 verilator\.log
 verilator\.tex
+verilator-config.cmake$
+verilator-config-version.cmake$
 verilator.pc$
 verilator_bin.*
 verilator_coverage_bin.*
@@ -42,11 +58,11 @@ verilator_coverage_bin.*
 ncverilog.history
 autom4te\.cache/
 nodist/
+ci/
 /simv$
 /simv.daidir/
 /vc_hdrs.h$
 /csrc/
-doxygen-doc/.*
-obj_dir/.*
+obj_dir.*
 TAGS
 .*~

Makefile.in

@@ -3,19 +3,15 @@
 #
 # This file is part of Verilator.
 #
-# Code available from: http://www.veripool.org/verilator
+# Code available from: https://verilator.org
 #
 #*****************************************************************************
 #
-# Copyright 2003-2018 by Wilson Snyder. This program is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
-#
-# Verilator is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 #
 #****************************************************************************/
 #
@@ -83,7 +79,7 @@ infodir = @infodir@
 pkgdatadir = @pkgdatadir@
 
 # Directory in which to install pkgconfig file
-# Generall ${prefix}/share/pkgconfig
+# Generally ${prefix}/share/pkgconfig
 pkgconfigdir = @pkgconfigdir@
 
 # Directory in which to install data across multiple architectures
@@ -103,28 +99,52 @@ PACKAGE_VERSION = @PACKAGE_VERSION@
 
 SHELL = /bin/sh
 
-SUBDIRS = src test_regress \
-	examples/hello_world_c  examples/hello_world_sc \
-	examples/tracing_c  examples/tracing_sc \
+SUBDIRS = docs src test_regress \
+	examples/cmake_hello_c \
+	examples/cmake_hello_sc \
+	examples/cmake_tracing_c \
+	examples/cmake_tracing_sc \
+	examples/cmake_protect_lib \
+	examples/make_hello_c \
+	examples/make_hello_sc \
+	examples/make_tracing_c \
+	examples/make_tracing_sc \
+	examples/make_protect_lib \
+	examples/xml_py \
 
-INFOS = README README.html README.pdf internals.txt internals.html \
-        internals.pdf verilator.txt verilator.html verilator.pdf \
-	$(VL_INST_MAN_FILES)
+INFOS = verilator.txt verilator.html verilator.pdf
+
+INFOS_OLD = README README.html README.pdf
 
 # Files that can be generated, but should be up to date for a distribution.
 DISTDEP = info Makefile
 
-DISTFILES_INC = $(INFOS) .gitignore Artistic COPYING COPYING.LESSER \
+DISTFILES_INC = $(INFOS) .gitignore \
 	*.in *.ac \
-	Changes TODO \
+	Artistic \
+	Changes \
+	LICENSE \
 	MANIFEST.SKIP \
+	README.adoc \
+	verilator-config.cmake.in \
+	verilator-config-version.cmake.in \
 	bin/verilator \
 	bin/verilator_coverage \
 	bin/verilator_difftree \
 	bin/verilator_gantt \
 	bin/verilator_includer \
 	bin/verilator_profcfunc \
-	doxygen-mainpage doxygen.config verilator_logo.png \
+	docs/.gitignore \
+	docs/CONTRIBUTING.adoc \
+	docs/CONTRIBUTORS \
+	docs/Makefile.in \
+	docs/TODO \
+	docs/doxygen-mainpage \
+	docs/doxygen.config \
+	docs/install.adoc \
+	docs/internals.adoc \
+	docs/verilator_logo.png \
+	docs/xml.adoc \
 	install-sh configure *.pod \
 	include/*.[chv]* \
 	include/*.in \
@@ -138,9 +158,15 @@ DISTFILES_INC = $(INFOS) .gitignore Artistic COPYING COPYING.LESSER \
 	src/.gdbinit \
 	src/*.pl src/*.pod \
 	examples/*/.*ignore examples/*/Makefile* \
-	examples/*/*.[chv]* examples/*/*.pl \
+	examples/*/*.[chv]* examples/*/vl_* \
+	examples/*/CMakeLists.txt \
 	test_*/.*ignore test_*/Makefile* test_*/*.cpp \
 	test_*/*.pl test_*/*.v test_*/*.vc test_*/*.vh \
+	test_regress/*.pl \
+	test_regress/Makefile \
+	test_regress/Makefile_obj \
+	test_regress/input.vc \
+	test_regress/CMakeLists.txt \
 	test_regress/t/t*/*.sv* \
 	test_regress/t/t*/*.v* \
 	test_regress/t/t*/*/*.sv* \
@@ -172,11 +198,14 @@ INST_PROJ_BIN_FILES = \
 
 DISTFILES := $(DISTFILES_INC)
 
-ifeq ($(OBJCACHE_JOBS),)
-ifneq ($(OBJCACHE_HOSTS),)
-export OBJCACHE_JOBS := -j $(shell objcache --jobs "$(OBJCACHE_HOSTS)")
-endif
-endif
+EXAMPLES_FIRST = \
+	examples/make_hello_c \
+	examples/make_hello_sc \
+
+EXAMPLES = $(EXAMPLES_FIRST) $(filter-out $(EXAMPLES_FIRST), $(sort $(wildcard examples/*)))
+
+# See uninstall also - don't put wildcards in this variable, it might uninstall other stuff
+VL_INST_MAN_FILES = verilator.1 verilator_coverage.1 verilator_gantt.1 verilator_profcfunc.1
 
 default: all
 all: all_nomsg msg_test
@@ -200,7 +229,9 @@ msg_test: all_nomsg
 
 .PHONY: test
 ifeq ($(CFG_WITH_LONGTESTS),yes)	# Local... Else don't burden users
-test: smoke-test examples test_regress
+test: smoke-test test_regress
+# examples is part of test_regress's test_regress/t/t_a2_examples.pl
+# (because that allows it to run in parallel with other test_regress's)
 else
 test: smoke-test examples
 endif
@@ -211,20 +242,22 @@ endif
 	@echo
 
 smoke-test: all_nomsg
-	test_regress/t/t_a_first_cc.pl
-	test_regress/t/t_a_first_sc.pl
+	test_regress/t/t_a1_first_cc.pl
+	test_regress/t/t_a2_first_sc.pl
 
 test_regress: all_nomsg
 	$(MAKE) -C test_regress
 
 examples: all_nomsg
-	for p in examples/* ; do \
+	for p in $(EXAMPLES) ; do \
 	  $(MAKE) -C $$p VERILATOR_ROOT=`pwd` || exit 10; \
 	done
 
+.PHONY: docs
+docs: info
+
 info: $(INFOS)
 
-# Use --no-split to avoid creating filenames > 14 chars.
 %.1: ${srcdir}/bin/%
 	pod2man $< $@
 
@@ -243,47 +276,12 @@ verilator.pdf: ${srcdir}/bin/verilator Makefile $(POD2LATEXFIX)
 	pdflatex verilator.tex
 	-rm -f verilator.toc verilator.aux verilator.idx verilator.out
 
-README: README.pod
-	-rm -f $@
-	$(POD2TEXT) --loose $< > $@
-
-README.html: README.pod
-	pod2html $< >$@
-
-# PDF needs DIST variables; but having configure.ac as dependency isn't detected
-README.pdf: README.pod Makefile $(POD2LATEXFIX)
-	pod2latex --full --out README.tex $<
-	$(PERL) $(POD2LATEXFIX) "$(DISTTITLE) README File" "${DISTDATE}" < README.tex > README2.tex
-	mv README2.tex README.tex
-	pdflatex README.tex
-	pdflatex README.tex
-	-rm -f README.toc README.aux README.idx README.out
-
-internals.txt: internals.pod
-	-rm -f $@
-	$(POD2TEXT) --loose $< > $@
-
-internals.html: internals.pod
-	pod2html $< >$@
-
-# PDF needs DIST variables; but having configure.ac as dependency isn't detected
-internals.pdf: internals.pod Makefile $(POD2LATEXFIX)
-	pod2latex --full --out internals.tex $<
-	$(PERL) $(POD2LATEXFIX) "$(DISTTITLE) Internals Manual" "${DISTDATE}" < internals.tex > internals2.tex
-	mv internals2.tex internals.tex
-	pdflatex internals.tex
-	pdflatex internals.tex
-	-rm -f internals.toc internals.aux internals.idx internals.out
-
 # See uninstall also - don't put wildcards in this variable, it might uninstall other stuff
 VL_INST_BIN_FILES = verilator verilator_bin verilator_bin_dbg verilator_coverage_bin_dbg \
 	verilator_coverage verilator_gantt verilator_includer verilator_profcfunc
 # Some scripts go into both the search path and pkgdatadir,
 # so they can be found by the user, and under $VERILATOR_ROOT.
 
-# See uninstall also - don't put wildcards in this variable, it might uninstall other stuff
-VL_INST_MAN_FILES = verilator.1 verilator_coverage.1 verilator_gantt.1 verilator_profcfunc.1
-
 VL_INST_INC_BLDDIR_FILES = \
 	include/verilated_config.h \
 	include/verilated.mk \
@@ -296,6 +294,7 @@ VL_INST_INC_SRCDIR_FILES = \
 
 VL_INST_DATA_SRCDIR_FILES = \
 	examples/*/*.[chv]*  examples/*/Makefile* \
+	examples/*/CMakeLists.txt
 
 installbin:
 	$(MKINSTALLDIRS) $(DESTDIR)$(bindir)
@@ -327,16 +326,25 @@ installdata:
 	; for p in $(VL_INST_INC_SRCDIR_FILES) ; do \
 	  $(INSTALL_DATA) $$p $(DESTDIR)$(pkgdatadir)/$$p; \
 	done
-	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/hello_world_c
-	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/hello_world_sc
-	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/tracing_c
-	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/tracing_sc
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/make_hello_c
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/make_hello_sc
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/make_tracing_c
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/make_tracing_sc
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/make_protect_lib
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/cmake_hello_c
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/cmake_hello_sc
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/cmake_tracing_c
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/cmake_tracing_sc
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/cmake_protect_lib
+	$(MKINSTALLDIRS) $(DESTDIR)$(pkgdatadir)/examples/xml_py
 	cd $(srcdir) \
 	; for p in $(VL_INST_DATA_SRCDIR_FILES) ; do \
 	  $(INSTALL_DATA) $$p $(DESTDIR)$(pkgdatadir)/$$p; \
 	done
 	$(MKINSTALLDIRS) $(DESTDIR)$(pkgconfigdir)
 	$(INSTALL_DATA) verilator.pc $(DESTDIR)$(pkgconfigdir)
+	$(INSTALL_DATA) verilator-config.cmake $(DESTDIR)$(pkgdatadir)
+	$(INSTALL_DATA) verilator-config-version.cmake $(DESTDIR)$(pkgdatadir)
 
 # We don't trust rm -rf, so rmdir instead as it will fail if user put in other files
 uninstall:
@@ -347,14 +355,23 @@ uninstall:
 	-cd $(DESTDIR)$(pkgdatadir) && rm -f $(VL_INST_INC_SRCDIR_FILES)
 	-cd $(DESTDIR)$(pkgdatadir) && rm -f $(VL_INST_DATA_SRCDIR_FILES)
 	-rm $(DESTDIR)$(pkgconfigdir)/verilator.pc
+	-rm $(DESTDIR)$(pkgdatadir)/verilator-config.cmake
+	-rm $(DESTDIR)$(pkgdatadir)/verilator-config-version.cmake
 	-rmdir $(DESTDIR)$(pkgdatadir)/bin
 	-rmdir $(DESTDIR)$(pkgdatadir)/include/gtkwave
 	-rmdir $(DESTDIR)$(pkgdatadir)/include/vltstd
 	-rmdir $(DESTDIR)$(pkgdatadir)/include
-	-rmdir $(DESTDIR)$(pkgdatadir)/examples/hello_world_c
-	-rmdir $(DESTDIR)$(pkgdatadir)/examples/hello_world_sc
-	-rmdir $(DESTDIR)$(pkgdatadir)/examples/tracing_c
-	-rmdir $(DESTDIR)$(pkgdatadir)/examples/tracing_sc
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/make_hello_c
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/make_hello_sc
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/make_tracing_c
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/make_tracing_sc
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/make_protect_lib
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/cmake_hello_c
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/cmake_hello_sc
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/cmake_tracing_c
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/cmake_tracing_sc
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/cmake_protect_lib
+	-rmdir $(DESTDIR)$(pkgdatadir)/examples/xml_py
 	-rmdir $(DESTDIR)$(pkgdatadir)/examples
 	-rmdir $(DESTDIR)$(pkgdatadir)
 	-rmdir $(DESTDIR)$(pkgconfigdir)
@@ -367,34 +384,9 @@ install-here: installman ftp
 ifeq ($(VERILATOR_AUTHOR_SITE),1)	# Local... Else don't burden users
 DISTNAMEREV = $(shell sed -e '/DTVERSION/!d' -e 's/.*verilator_\([^"]*\).*/\1/' -e q ${srcdir}/src/config_rev.h)
 
-DIRPROJECT := $(shell project_dir --project)
 VERILATOR_CAD_DIR = $(CAD_DIR)/verilator/$(DISTNAMEREV)/$(DIRPROJECT_ARCH)
 INST_PROJ_CVS = cp_if_cvs_diff
 
-install-project: dist
-	@echo "Install-project to $(DIRPROJECT)"
-	strip bin/verilator_bin*
-	strip bin/verilator_coverage_bin*
-	$(MAKE) install-project-quick
-	for p in $(VL_INST_MAN_FILES) ; do \
-	  $(INSTALL_DATA) $$p $(DIRPROJECT_PREFIX)/man/man1/$$p; \
-	done
-	$(INST_PROJ_CVS) $(DISTNAME).tgz $(DIRPROJECT)/hw/utils/verilator/verilator.tgz
-	rm $(DISTNAME).tgz
-
-install-project-quick:
-ifeq ($(CFG_WITH_DEFENV),yes)
-	@echo "%Error: Reconfigure with './configure --disable-defenv' to avoid hardcoded paths."
-	false
-endif
-	@echo "Install-project-quick (no strip) to $(DIRPROJECT)"
-	for p in $(INST_PROJ_FILES) ; do \
-	  $(INST_PROJ_CVS) $$p $(DIRPROJECT)/hw/utils/verilator/$$p; \
-	done
-	for p in $(INST_PROJ_BIN_FILES) ; do \
-	  $(INST_PROJ_CVS) $$p $(DIRPROJECT)/hw/utils/verilator/$$p-$(DIRPROJECT_ARCH); \
-	done
-
 install-cadtools: dist
 	@echo "Install-project to $(CAD_DIR)"
 	strip bin/verilator_bin*
@@ -435,7 +427,8 @@ CPPCHECK_H = $(wildcard \
 	$(srcdir)/src/*.h )
 CPPCHECK = src/cppcheck_filtered
 CPPCHECK_FLAGS = --enable=all --inline-suppr \
-	--suppress=unusedScopedObject --suppress=cstyleCast --suppress=useInitializationList
+	--suppress=unusedScopedObject --suppress=cstyleCast --suppress=useInitializationList \
+	--suppress=nullPointerRedundantCheck
 CPPCHECK_FLAGS += --xml
 CPPCHECK_DEP = $(subst .cpp,.cppcheck,$(CPPCHECK_CPP))
 CPPCHECK_INC = -I$(srcdir)/include -I$(srcdir)/src/obj_dbg -I$(srcdir)/src
@@ -463,6 +456,14 @@ analyzer-include:
 	-rm -rf examples/*/obj*
 	scan-build $(MAKE) -k examples
 
+CLANGFORMAT = clang-format
+CLANGFORMAT_FLAGS = -i
+
+clang-format:
+	@$(CLANGFORMAT) --version | egrep 10.0 > /dev/null \
+		|| echo "*** You are not using clang-format 10.0, indents may differ from master's ***"
+	$(CLANGFORMAT) $(CLANGFORMAT_FLAGS) $(CPPCHECK_CPP) $(CPPCHECK_H)
+
 ftp: info
 
 install-msg:
@@ -472,7 +473,7 @@ install-msg:
 	@echo "Installed examples to $(DESTDIR)$(pkgdatadir)/examples"
 	@echo
 	@echo "For documentation see 'man verilator' or 'verilator --help'"
-	@echo "For forums and to report bugs see http://www.veripool.org/verilator"
+	@echo "For forums and to report bugs see https://verilator.org"
 	@echo
 
 IN_WILD := ${srcdir}/*.in ${srcdir}/*/*.in
@@ -511,11 +512,13 @@ clean mostlyclean distclean maintainer-clean::
 	rm -f *.pg *.pgs *.toc *.tp *.tps *.vr *.vrs *.idx
 	rm -f *.ev *.evs *.ov *.ovs *.cv *.cvs *.ma *.mas
 	rm -f *.tex
+	rm -rf examples/*/obj_dir* examples/*/logs
 	rm -rf test_*/obj_dir
-	rm -rf examples/*/obj_dir examples/*/logs
+	rm -rf nodist/fuzzer/dictionary
+	rm -rf nodist/obj_dir
 
 distclean maintainer-clean::
-	rm -f *.info* *.1 $(INFOS)
+	rm -f *.info* *.1 $(INFOS) $(INFOS_OLD) $(VL_INST_MAN_FILES)
 	rm -f Makefile config.status config.cache config.log TAGS
 	rm -f verilator_bin* verilator_coverage_bin*
 	rm -f bin/verilator_bin* bin/verilator_coverage_bin*
@@ -530,7 +533,7 @@ TAGS:	$(TAGFILES)
 .PHONY: doxygen
 
 doxygen:
-	$(DOXYGEN) doxygen.config
+	$(MAKE) -C docs doxygen
 
 ######################################################################
 # Test targets

README.adoc

@@ -0,0 +1,151 @@
+// Github doesn't render images unless absolute URL
+:!toc:
+
+ifdef::env-github[]
+image:https://img.shields.io/badge/License-LGPL%20v3-blue.svg[license LGPLv3,link=https://www.gnu.org/licenses/lgpl-3.0]
+image:https://img.shields.io/badge/License-Artistic%202.0-0298c3.svg[license Artistic-2.0,link=https://opensource.org/licenses/Artistic-2.0]
+image:https://api.codacy.com/project/badge/Grade/fa78caa433c84a4ab9049c43e9debc6f[Code Quality,link=https://www.codacy.com/gh/verilator/verilator]
+image:https://travis-ci.com/verilator/verilator.svg?branch=master[Build Status (Travis CI),link=https://travis-ci.com/verilator/verilator]
+endif::[]
+
+ifdef::env-github[]
+:link_verilator_contributing: link:docs/CONTRIBUTING.adoc
+:link_verilator_install: link:docs/install.adoc
+endif::[]
+ifndef::env-github[]
+:link_verilator_contributing: https://github.com/verilator/verilator/blob/master/docs/CONTRIBUTING.adoc
+:link_verilator_install: https://verilator.org/install
+endif::[]
+:link_verilator_commercial_support: https://verilator.org/verilator_commercial_support
+
+== Welcome to Verilator
+
+[cols="a,a",indent=0,frame="none"]
+|===
+^.^| *Welcome to Verilator, the fastest Verilog HDL simulator.*
++++ <br/> +++ &bullet; Accepts synthesizable Verilog or SystemVerilog
++++ <br/> +++ &bullet; Performs lint code-quality checks
++++ <br/> +++ &bullet; Compiles into multithreaded {cpp}, or SystemC
++++ <br/> +++ &bullet; Creates XML to front-end your own tools
+<.^|image:https://www.veripool.org/img/verilator_256_200_min.png[Logo,256,200]
+
+>.^|image:https://www.veripool.org/img/verilator_multithreaded_performance_bg-min.png[,388,178]
+^.^| *Fast*
++++ <br/> +++ &bullet; Outperforms many commercial simulators
++++ <br/> +++ &bullet; Single- and multi-threaded output models
+
+^.^| *Widely Used*
++++ <br/> +++ &bullet; Wide industry and academic deployment
++++ <br/> +++ &bullet; Out-of-the-box support from Arm, and RISC-V vendor IP
+<.^|image:https://www.veripool.org/img/verilator_usage_400x200-min.png[,400,200]
+
+>.^|image:https://www.veripool.org/img/verilator_community_400x125-min.png[,400,125]
+^.^| *Community Driven & Openly Licensed*
++++ <br/> +++ &bullet; Guided by the https://chipsalliance.org/[CHIPS Alliance] and https://www.linuxfoundation.org/[Linux Foundation]
++++ <br/> +++ &bullet; Open, and free as in both speech and beer
++++ <br/> +++ &bullet; More simulation for your verification budget
+
+^.^| *Commercial Support Available*
++++ <br/> +++ &bullet; Commercial support contracts
++++ <br/> +++ &bullet; Design support contracts
++++ <br/> +++ &bullet; Enhancement contracts
+<.^|image:https://www.veripool.org/img/verilator_support_400x125-min.png[,400,125]
+
+|===
+
+== What Verilator Does
+
+Verilator is invoked with parameters similar to GCC or Synopsys's VCS.  It
+"Verilates" the specified Verilog or SystemVerilog code by
+reading it, performing lint checks, and optionally inserting assertion
+checks and coverage-analysis points.  It outputs single- or multi-threaded
+.cpp and .h files, the "Verilated" code.
+
+The user writes a little {cpp}/SystemC wrapper file, which instantiates the
+"Verilated" model of the user's top level module.  These {cpp}/SystemC
+files are then compiled by a {cpp} compiler (gcc/clang/MSVC++).  The
+resulting executable performs the design simulation.  Verilator also
+supports linking its generated libraries, optionally encrypted, into other
+simulators.
+
+Verilator may not be the best choice if you are expecting a full featured
+replacement for NC-Verilog, VCS or another commercial Verilog simulator, or
+if you are looking for a behavioral Verilog simulator e.g. for a quick
+class project (we recommend http://iverilog.icarus.com[Icarus Verilog] for
+this.)  However, if you are looking for a path to migrate SystemVerilog to
+{cpp} or SystemC, and your team is comfortable writing just a
+touch of {cpp} code, Verilator is the tool for you.
+
+== Performance
+
+Verilator does not simply convert Verilog HDL to {cpp} or SystemC.  Rather,
+Verilator compiles your code into a much faster optimized and optionally
+thread-partitioned model, which is in turn wrapped inside a
+{cpp}/SystemC/{cpp}-under-Python module.  The results are a compiled
+Verilog model that executes even on a single-thread over 10x faster than
+standalone SystemC, and on a single thread is about 100 times faster than
+interpreted Verilog simulators such as http://iverilog.icarus.com[Icarus
+Verilog]. Another 2-10x speedup might be gained from multithreading
+(yielding 200-1000x total over interpreted simulators).
+
+Verilator has typically similar or better performance versus the
+closed-source Verilog simulators (Carbon Design Systems Carbonator,
+Modelsim, Cadence Incisive/NC-Verilog, Synopsys VCS, VTOC, and Pragmatic
+CVer/CVC). But, Verilator is open-sourced, so you can spend on computes
+rather than licenses. Thus Verilator gives you the best cycles/dollar.
+
+For more information on how Verilator stacks up to some of the other
+closed-sourced and open-sourced Verilog simulators, see the
+https://www.veripool.org/verilog_sim_benchmarks.html[Verilog Simulator
+Benchmarks].  (If you benchmark Verilator, please see the notes in the
+https://verilator.org/verilator_doc.pdf[Verilator manual (PDF)], and also
+if possible post on the forums the results; there may be additional tweaks
+possible.)
+
+== Installation & Documentation
+
+For more information:
+
+* {link_verilator_install}[Verilator installation and package directory
+  structure]
+
+* https://verilator.org/verilator_doc.html[Verilator manual (HTML)],
+or https://verilator.org/verilator_doc.pdf[Verilator manual (PDF)]
+
+* https://verilator.org/forum[Verilator forum]
+
+* https://verilator.org/issues[Verilator Issues]
+
+== Support
+
+Verilator is a community project, guided by the
+https://chipsalliance.org/[CHIPS Alliance] under the
+https://www.linuxfoundation.org/[Linux Foundation].
+
+We appreciate and welcome your contributions in whatever form; please see
+{link_verilator_contributing}[Contributing to Verilator].  Thanks to our
+https://verilator.org/verilator_doc.html#CONTRIBUTORS[Contributors and
+Sponsors].
+
+Verilator also supports and encourages commercial support models and
+organizations; please see {link_verilator_commercial_support}[Verilator
+Commercial Support].
+
+== Related Projects
+
+* http://gtkwave.sourceforge.net/[GTKwave] - Waveform viewer for Verilator
+traces.
+
+* http://iverilog.icarus.com[Icarus Verilog] - Icarus is a full featured
+interpreted Verilog simulator. If Verilator does not support your needs,
+perhaps Icarus may.
+
+== Open License
+
+Verilator is Copyright 2003-2020 by Wilson Snyder.  (Report bugs to
+https://verilator.org/issues[Verilator Issues].)
+
+Verilator is free software; you can redistribute it and/or modify it under
+the terms of either the GNU Lesser General Public License Version 3 or the
+Perl Artistic License Version 2.0.  See the documentation for more
+details.

README.pod

@@ -1,211 +0,0 @@
-# DESCRIPTION: DOCUMENT source run through perl to produce README file
-# Use 'make README' to produce the output file
-
-=pod
-
-=head1 NAME
-
-This is the Verilator package README file.
-
-=head1 DISTRIBUTION
-
-http://www.veripool.org/verilator
-
-This package is Copyright 2003-2018 by Wilson Snyder.  (Report bugs to
-L<http://www.veripool.org/>.)
-
-Verilator is free software; you can redistribute it and/or modify it under
-the terms of either the GNU Lesser General Public License Version 3 or the
-Perl Artistic License Version 2.0.  (See the documentation for more
-details.)
-
-This program is distributed in the hope that it will be useful, but WITHOUT
-ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-more details.
-
-=head1 DESCRIPTION
-
-Verilator converts synthesizable (generally not behavioral) Verilog code
-into C++ or SystemC code.  It is not a complete simulator, just a
-translator.
-
-Verilator is invoked with parameters similar to GCC or Synopsys's VCS.  It
-reads the specified Verilog code, lints it, and optionally adds coverage
-code.  For C++ format, it outputs .cpp and .h files.  For SystemC format,
-it outputs .cpp and .h files using the standard SystemC headers.
-
-The resulting files are then compiled with C++.  The user writes a little
-C++ wrapper file, which instantiates the top level module.  This is
-compiled in C++, and linked with the Verilated files.
-
-The resulting executable will perform the actual simulation.
-
-=head1 SUPPORTED SYSTEMS
-
-Verilator is developed and has primary testing on Ubuntu.  Versions have
-also built on Redhat Linux, Macs OS-X, HPUX and Solaris.  It should run
-with minor porting on any Linix-ish platform.  Verilator also works on
-Windows under Cygwin, and Windows under MinGW (gcc -mno-cygwin).  Verilated
-output (not Verilator itself) compiles under MSVC++ 2008 and newer.
-
-=head1 INSTALLATION
-
-For more details see
-L<http://www.veripool.org/projects/verilator/wiki/Installing>.
-
-If you will be modifying Verilator, you should use the "git" method as it
-will let you track changes.
-
-=over 4
-
-=item
-
-The latest version is available at L<http://www.veripool.org/verilator>.
-
-Download the latest package from that site, and decompress.
-
-    tar xvzf verilator_version.tgz
-
-=item
-
-If you will be using SystemC (vs straight C++ output), download SystemC
-from L<http://www.systemc.org>.  Follow their installation instructions.
-You will need to set SYSTEMC_INCLUDE to point to the include directory with
-systemc.h in it, and SYSTEMC_LIBDIR to points to the directory with
-libsystemc.a in it.  (Older installations may set SYSTEMC and SYSTEMC_ARCH
-instead.)
-
-=item
-
-To use Verilator you will need the C<perl>, C<make> (or C<gmake>), and
-C<g++> (or C<clang>) packages.
-
-To use Verilator LXT2 or FST tracing you will need the C<gtkwave> and C<libgz> (on
-Ubuntu C<zlibc> C<zlib1g> C<zlib1g-dev>) packages installed.
-
-To compile Verilator in addition to the above you need the C<flex>,
-C<bison> and C<texi2html> packages installed.
-
-=item
-
-C<cd> to the Verilator directory containing this README.
-
-=item
-
-You now have to decide how you're going to eventually install the kit.
-
-Note Verilator builds the current value of VERILATOR_ROOT, SYSTEMC_INCLUDE,
-and SYSTEMC_LIBDIR as defaults into the executable, so try to have them
-correct before configuring.
-
-=over 4
-
-=item 1.
-
-Our personal favorite is to always run Verilator from the kit directory.
-This allows the easiest experimentation and upgrading.  It's also how most
-EDA tools operate; to run you point to the tarball, no install is needed.
-
-    export VERILATOR_ROOT=`pwd`   # if your shell is bash
-    setenv VERILATOR_ROOT `pwd`   # if your shell is csh
-    ./configure
-
-=item 2.
-
-To install globally onto a "cad" disk with multiple versions of every tool,
-and add it to path using Modules/modulecmd:
-
-    unset VERILATOR_ROOT      # if your shell is bash
-    unsetenv VERILATOR_ROOT   # if your shell is csh
-    # For the tarball, use the version number instead of git describe
-    ./configure --prefix /CAD_DISK/verilator/`git describe | sed "s/verilator_//"`
-
-    After installing you'll want a module file like the following:
-
-    set install_root /CAD_DISK/verilator/{version-number-used-above}
-    unsetenv VERILATOR_ROOT
-    prepend-path PATH $install_root/bin
-    prepend-path MANPATH $install_root/man
-    prepend-path PKG_CONFIG_PATH $install_root/share/pkgconfig
-
-=item 3.
-
-The next option is to install it globally, using the normal system paths:
-
-    unset VERILATOR_ROOT      # if your shell is bash
-    unsetenv VERILATOR_ROOT   # if your shell is csh
-    ./configure
-
-=item 4.
-
-Alternatively you can configure a prefix that install will populate, as
-most GNU tools support:
-
-    unset VERILATOR_ROOT      # if your shell is bash
-    unsetenv VERILATOR_ROOT   # if your shell is csh
-    ./configure --prefix /opt/verilator-VERSION
-
-Then after installing you will need to add /opt/verilator-VERSION/bin to
-PATH.
-
-=back
-
-=item
-
-Type C<make> to compile Verilator.
-
-Type C<make test> to check the compilation.
-
-Configure with C<--enable-longtests> for more complete developer tests.
-Additional packages may be required for these tests.
-
-You may get a error about a typedef conflict for uint32_t.  Edit
-verilated.h to change the typedef to work, probably to @samp{typedef
-unsigned long uint32_t;}.
-
-=item
-
-If you used the VERILATOR_ROOT scheme you're done.  Programs should set the
-environment variable VERILATOR_ROOT to point to this distribution, then
-execute $VERILATOR_ROOT/bin/verilator, which will find the path to all
-needed files.
-
-If you used the prefix scheme, now do a C<make install>.  To run verilator,
-have the verilator binary directory in your PATH (this should already be
-true if using the default configure), and make sure VERILATOR_ROOT is not
-set.
-
-You may now wish to consult the examples directory. Type C<make> inside any
-example directory to run the example.
-
-=back
-
-=head1 USAGE DOCUMENTATION
-
-Detailed documentation and the man page can be seen by running:
-
-    bin/verilator --help
-
-or reading verilator.txt in the same directory as this README.
-
-=head1 DIRECTORY STRUCTURE
-
-The directories in the kit after de-taring are as follows:
-
-    bin/verilator               => Compiler Wrapper invoked to Verilate code
-    include/                    => Files that should be in your -I compiler path
-    include/verilated*.cpp      => Global routines to link into your simulator
-    include/verilated*.h        => Global headers
-    include/verilated.v         => Stub defines for linting
-    include/verilated.mk        => Common makefile
-    src/                        => Translator source code
-    examples/hello_world_c      => Example simple Verilog->C++ conversion
-    examples/hello_world_sc     => Example simple Verilog->SystemC conversion
-    examples/tracing_c          => Example Verilog->C++ with tracing
-    examples/tracing_sc         => Example Verilog->SystemC with tracing
-    test_regress                => Internal tests
-
-=head1 LIMITATIONS
-
-See verilator.txt (or execute C<bin/verilator --help>) for limitations.

bin/verilator_coverage

@@ -1,29 +1,15 @@
-: # -*-Mode: perl;-*- use perl, wherever it is
-eval 'exec perl -wS $0 ${1+"$@"}'
-  if 0;
+#!/usr/bin/env perl
 ######################################################################
 #
-# Copyright 2003-2018 by Wilson Snyder. This program is free software; you
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
 # can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
 #
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
 ######################################################################
 
 require 5.006_001;
 use warnings;
-BEGIN {
-    if ($ENV{DIRPROJECT} && $ENV{DIRPROJECT_PERL_BOOT}) {
-	# Magic to allow author testing of perl packages in local directory
-	require $ENV{DIRPROJECT}."/".$ENV{DIRPROJECT_PERL_BOOT};
-    }
-}
-
 use Getopt::Long;
 use FindBin qw($RealBin $RealScript);
 use IO::File;
@@ -56,12 +42,12 @@ foreach my $sw (@ARGV) {
 
 Getopt::Long::config("no_auto_abbrev","pass_through");
 if (! GetOptions (
-	  # Major operating modes
-	  "help"	=> \&usage,
-	  "debug:s"	=> \&debug,
-	  # "version!"	=> \&version,	# Also passthru'ed
-	  # Additional parameters
-	  "<>"		=> sub {},	# Ignored
+          # Major operating modes
+          "help"        => \&usage,
+          "debug:s"     => \&debug,
+          # "version!"  => \&version,   # Also passthru'ed
+          # Additional parameters
+          "<>"          => sub {},      # Ignored
     )) {
     pod2usage(-exitstatus=>2, -verbose=>0);
 }
@@ -73,7 +59,7 @@ run(verilator_coverage_bin()
 #----------------------------------------------------------------------
 
 sub usage {
-    pod2usage(-verbose=>2, -exitval=>2, -output=>\*STDOUT);
+    pod2usage(-verbose=>2, -exitval=>0, -output=>\*STDOUT);
 }
 
 sub debug {
@@ -90,25 +76,25 @@ sub verilator_coverage_bin {
     my $bin = "";
     # Use VERILATOR_ROOT if defined, else assume verilator_bin is in the search path
     my $basename = ($ENV{VERILATOR_COVERAGE_BIN}
-		    || "verilator_coverage_bin_dbg");
+                    || "verilator_coverage_bin_dbg");
     if (defined($ENV{VERILATOR_ROOT})) {
-	my $dir = $ENV{VERILATOR_ROOT};
+        my $dir = $ENV{VERILATOR_ROOT};
         if (-x "$dir/bin/$basename"
             || -x "$dir/bin/$basename.exe") {  # From a "make install" into VERILATOR_ROOT
-	    $bin = "$dir/bin/$basename";
-	} else {
-	    $bin = "$dir/$basename";  # From pointing to kit directory
-	}
+            $bin = "$dir/bin/$basename";
+        } else {
+            $bin = "$dir/$basename";  # From pointing to kit directory
+        }
     } else {
         if (-x "$RealBin/$basename"
             || -x "$RealBin/$basename.exe") {
-	    $bin = "$RealBin/$basename";  # From path/to/verilator with verilator_bin installed
-	} else {
-	    $bin = $basename;  # Find in PATH
-	}
-	# Note we don't look under bin/$basename which would be right if running
-	# in the kit dir. Running that would likely break, since
-	# VERILATOR_ROOT wouldn't be set and Verilator won't find internal files.
+            $bin = "$RealBin/$basename";  # From path/to/verilator with verilator_bin installed
+        } else {
+            $bin = $basename;  # Find in PATH
+        }
+        # Note we don't look under bin/$basename which would be right if running
+        # in the kit dir. Running that would likely break, since
+        # VERILATOR_ROOT wouldn't be set and Verilator won't find internal files.
     }
     return $bin;
 }
@@ -125,23 +111,28 @@ sub run {
     system($command);
     my $status = $?;
     if ($status) {
-	if ($! =~ /no such file or directory/i) {
-	    warn "%Error: verilator_coverage: Misinstalled, or VERILATOR_ROOT might need to be in environment\n";
-	}
-	if ($Debug) {  # For easy rerunning
-	    warn "%Error: export VERILATOR_ROOT=".($ENV{VERILATOR_ROOT}||"")."\n";
-	    warn "%Error: $command\n";
-	}
-	if ($status & 127) {
-	    if (($status & 127) == 8 || ($status & 127) == 11) { # SIGFPA or SIGSEGV
-		warn "%Error: Verilator_coverage internal fault, sorry.\n" if !$Debug;
-	    } elsif (($status & 127) == 6) {  # SIGABRT
-		warn "%Error: Verilator_coverage aborted.\n" if !$Debug;
-	    } else {
-		warn "%Error: Verilator_coverage threw signal $status.\n" if !$Debug;
-	    }
-	}
-	die "%Error: Command Failed $command\n";
+        if ($! =~ /no such file or directory/i) {
+            warn "%Error: verilator_coverage: Misinstalled, or VERILATOR_ROOT might need to be in environment\n";
+        }
+        if ($Debug) {  # For easy rerunning
+            warn "%Error: export VERILATOR_ROOT=".($ENV{VERILATOR_ROOT}||"")."\n";
+            warn "%Error: $command\n";
+        }
+        if ($status & 127) {
+            if (($status & 127) == 8 || ($status & 127) == 11) { # SIGFPA or SIGSEGV
+                warn "%Error: Verilator_coverage internal fault, sorry.\n" if !$Debug;
+            } elsif (($status & 127) == 6) {  # SIGABRT
+                warn "%Error: Verilator_coverage aborted.\n" if !$Debug;
+            } else {
+                warn "%Error: Verilator_coverage threw signal $status.\n" if !$Debug;
+            }
+        }
+        if ($status != 256 || $Debug) {  # i.e. not normal exit(1)
+            warn "%Error: Command Failed $command\n";
+        }
+        exit $! if $!;  # errno
+        exit $? >> 8 if $? >> 8;  # child exit status
+        exit 255;  # last resort
     }
 }
 
@@ -271,12 +262,14 @@ Specifies a module search directory.
 
 =head1 DISTRIBUTION
 
-The latest version is available from L<http://www.veripool.org/>.
+The latest version is available from L<https://verilator.org>.
 
-Copyright 2003-2018 by Wilson Snyder.  Verilator is free software; you can
-redistribute it and/or modify the Verilator internals under the terms of
-either the GNU Lesser General Public License Version 3 or the Perl Artistic
-License Version 2.0.
+Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+can redistribute it and/or modify the Verilator internals under the terms
+of either the GNU Lesser General Public License Version 3 or the Perl
+Artistic License Version 2.0.
+
+SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
 =head1 AUTHORS
 

bin/verilator_difftree

@@ -1,10 +1,7 @@
-: # -*-Mode: perl;-*- use perl, wherever it is
-eval 'exec perl -wS $0 ${1+"$@"}'
-  if 0;
+#!/usr/bin/env perl
 # See copyright, etc in below POD section.
 ######################################################################
 
-require 5.006_001;
 use warnings;
 use Getopt::Long;
 use IO::File;
@@ -38,11 +35,11 @@ my $Opt_Lineno = 1;
 autoflush STDOUT 1;
 autoflush STDERR 1;
 Getopt::Long::config("no_auto_abbrev");
-if (! GetOptions (
-	  "help"	=> \&usage,
-	  "debug"	=> \&debug,
-	  "<>"		=> \&parameter,
-	  "lineno!"	=> \$Opt_Lineno,
+if (! GetOptions(
+          "help"        => \&usage,
+          "debug"       => \&debug,
+          "<>"          => \&parameter,
+          "lineno!"     => \$Opt_Lineno,
     )) {
     die "%Error: Bad usage, try 'verilator_difftree --help'\n";
 }
@@ -68,22 +65,22 @@ sub diff_dir {
     my %files;
 
     foreach my $fn (glob("$a/*.tree")) {
-	(my $base = $fn) =~ s!.*/!!;
-	$files{$base}{a} = $fn;
+        (my $base = $fn) =~ s!.*/!!;
+        $files{$base}{a} = $fn;
     }
     foreach my $fn (glob("$b/*.tree")) {
-	(my $base = $fn) =~ s!.*/!!;
-	$files{$base}{b} = $fn;
+        (my $base = $fn) =~ s!.*/!!;
+        $files{$base}{b} = $fn;
     }
     my $any;
     foreach my $base (sort (keys %files)) {
-	my $a = $files{$base}{a};
-	my $b = $files{$base}{b};
-	next if !$a || !$b;
-	print "="x70,"\n";
-	print "= $a <-> $b\n";
-	diff_file($a,$b);
-	$any = 1;
+        my $a = $files{$base}{a};
+        my $b = $files{$base}{b};
+        next if !$a || !$b;
+        print "="x70,"\n";
+        print "= $a <-> $b\n";
+        diff_file($a,$b);
+        $any = 1;
     }
     $any or warn("%Warning: No .tree files found that have similar base names:\n    "
                  .join("\n    ", sort keys %files),"\n");
@@ -101,7 +98,7 @@ sub diff_file {
     my $vera = version_from($a);
     my $verb = version_from($b);
     my $verCvt = (($vera < 0x3900 && $verb >= 0x3900)
-		  || ($vera >= 0x3900 && $verb < 0x3900));
+                  || ($vera >= 0x3900 && $verb < 0x3900));
 
     filter($a, $tmp_a, $verCvt);
     filter($b, $tmp_b, $verCvt);
@@ -115,8 +112,8 @@ sub version_from {
     # Return dump format
     my $f1 = IO::File->new ($fn) or die "%Error: $! $fn,";
     while (defined (my $line=$f1->getline())) {
-	last if $. > 10;
-	return hex $1 if $line =~ /\(format (0x[0-9.]+)\)/;
+        last if $. > 10;
+        return hex $1 if $line =~ /\(format (0x[0-9.]+)\)/;
     }
     return 1.0;
 }
@@ -130,36 +127,36 @@ sub filter {
     my $f2 = IO::File->new ($fn2,"w") or die "%Error: $! $fn2,";
     while (defined (my $line=$f1->getline())) {
       same_line:
-	next if $line =~ / This=/;
-	$line =~ s/0x[a-f0-9]+/0x/g;
-	$line =~ s/<e[0-9]+\#?>/<e>/g;
-	$line =~ s/{[a-z]*\d+}/{}/g if !$Opt_Lineno;
-	if ($verCvt) {
-	    next if $line =~ /^     NETLIST/;
-	    $line =~ s!\@dt=0x\(G?/?([^)]+)\)!$1!g;  # NEW: @dt -> OLD: non @dt format
-	    #					     # Below Ver1_Non_Dtyped may replace above further
-	    if ($line =~ /: ([A-Z]+) /) {
-		my $type = $1;
-		next if $type =~ 'DTYPE';
-		if ($type eq 'TYPETABLE' || $type eq 'RANGE') {
-		    $line =~ /^(\s+\S+:) /; my $prefix = $1;
-		    while (defined ($line=$f1->getline())) {
-			next if $line =~ /^\s+[a-z]/;  # Table body
-			next if $line =~ /^${prefix}[0-9]:/;
-			goto same_line;
-		    }
-		    next;
-		}
-		if ($Ver1_Non_Dtyped{$type}) {
-		    $line =~ s! w[0-9]+!!g;
-		}
-	    }
-	    $line =~ s!\@dt=0$!NoW!g;   # NEW: dt=null -> common format
-	    $line =~ s!\@dt=0 !NoW !g;  # NEW: dt=null -> common format
-	    $line =~ s! s?w0$! NoW!g;   # OLD: no width -> common format
-	    $line =~ s! s?w0 ! NoW !g;  # OLD: no width -> common format
-	}
-	print $f2 $line;
+        next if $line =~ / This=/;
+        $line =~ s/0x[a-f0-9]+/0x/g;
+        $line =~ s/<e[0-9]+\#?>/<e>/g;
+        $line =~ s/{[a-z]*\d+}/{}/g if !$Opt_Lineno;
+        if ($verCvt) {
+            next if $line =~ /^     NETLIST/;
+            $line =~ s!\@dt=0x\(G?/?([^)]+)\)!$1!g;  # NEW: @dt -> OLD: non @dt format
+            #                                        # Below Ver1_Non_Dtyped may replace above further
+            if ($line =~ /: ([A-Z]+) /) {
+                my $type = $1;
+                next if $type =~ 'DTYPE';
+                if ($type eq 'TYPETABLE' || $type eq 'RANGE') {
+                    $line =~ /^(\s+\S+:) /; my $prefix = $1;
+                    while (defined ($line=$f1->getline())) {
+                        next if $line =~ /^\s+[a-z]/;  # Table body
+                        next if $line =~ /^${prefix}[0-9]:/;
+                        goto same_line;
+                    }
+                    next;
+                }
+                if ($Ver1_Non_Dtyped{$type}) {
+                    $line =~ s! w[0-9]+!!g;
+                }
+            }
+            $line =~ s!\@dt=0$!NoW!g;   # NEW: dt=null -> common format
+            $line =~ s!\@dt=0 !NoW !g;  # NEW: dt=null -> common format
+            $line =~ s! s?w0$! NoW!g;   # OLD: no width -> common format
+            $line =~ s! s?w0 ! NoW !g;  # OLD: no width -> common format
+        }
+        print $f2 $line;
     }
     $f1->close;
     $f2->close;
@@ -168,8 +165,8 @@ sub filter {
 #----------------------------------------------------------------------
 
 sub usage {
-    pod2usage(-verbose=>2, -exitval=>2, -output=>\*STDOUT);
-    exit(1);
+    pod2usage(-verbose=>2, -exitval=>0, -output=>\*STDOUT);
+    exit(1);  # Unreachable
 }
 
 sub debug {
@@ -179,11 +176,11 @@ sub debug {
 sub parameter {
     my $param = shift;
     if (!defined $Opt_A) {
-	$Opt_A = $param;
+        $Opt_A = $param;
     } elsif (!defined $Opt_B) {
-	$Opt_B = $param;
+        $Opt_B = $param;
     } else {
-	die "%Error: Unknown parameter: $param\n";
+        die "%Error: Unknown parameter: $param\n";
     }
 }
 
@@ -234,11 +231,14 @@ Do not show differences in line numbering.
 
 =head1 DISTRIBUTION
 
-The latest version is available from L<http://www.veripool.org/verilator>.
+The latest version is available from L<https://verilator.org>.
 
-Copyright 2005-2018 by Wilson Snyder.  This package is free software; you can
-redistribute it and/or modify it under the terms of either the GNU Lesser
-General Public License Version 3 or the Perl Artistic License Version 2.0.
+Copyright 2005-2020 by Wilson Snyder. This program is free software; you
+can redistribute it and/or modify it under the terms of either the GNU
+Lesser General Public License Version 3 or the Perl Artistic License
+Version 2.0.
+
+SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
 =head1 AUTHORS
 

bin/verilator_gantt

@@ -1,11 +1,9 @@
-: # -*-Mode: perl;-*- use perl, wherever it is
-eval 'exec perl -wS $0 ${1+"$@"}'
-  if 0;
+#!/usr/bin/env perl
 # See copyright, etc in below POD section.
 ######################################################################
 
-use strict;
 use warnings;
+use strict;
 use Getopt::Long;
 use IO::File;
 use Pod::Usage;
@@ -43,8 +41,8 @@ exit(0);
 #######################################################################
 
 sub usage {
-    pod2usage(-verbose=>2, -exitval=>2, -output=>\*STDOUT);
-    exit(1);
+    pod2usage(-verbose=>2, -exitval=>0, -output=>\*STDOUT);
+    exit(1);  # Unreachable
 }
 
 sub parameter {
@@ -125,13 +123,13 @@ sub report {
     }
 
     my $nthreads = scalar keys %Threads;
-    $Global{cpus}{cpu_time} = {};
+    $Global{cpus} = {};
     foreach my $thread (keys %Threads) {
         # Make potentially multiple characters per column
         foreach my $start (keys %{$Threads{$thread}}) {
             my $cpu = $Threads{$thread}{$start}{cpu};
             my $elapsed = $Threads{$thread}{$start}{end} - $start;
-            $Global{cpus}{cpu_time}{$cpu} += $elapsed;
+            $Global{cpus}{$cpu}{cpu_time} += $elapsed;
         }
     }
 
@@ -538,11 +536,14 @@ verilator_gantt.vcd.
 
 =head1 DISTRIBUTION
 
-The latest version is available from L<http://www.veripool.org/>.
+The latest version is available from L<https://verilator.org>.
 
-Copyright 2018-2018 by Wilson Snyder.  Verilator is free software; you can
-redistribute it and/or modify it under the terms of either the GNU Lesser
-General Public License Version 3 or the Perl Artistic License Version 2.0.
+Copyright 2018-2020 by Wilson Snyder. This program is free software; you
+can redistribute it and/or modify it under the terms of either the GNU
+Lesser General Public License Version 3 or the Perl Artistic License
+Version 2.0.
+
+SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
 =head1 AUTHORS
 

bin/verilator_includer

@@ -1,11 +1,11 @@
-: # -*-Mode: perl;-*- use perl, wherever it is
-eval 'exec perl -wS $0 ${1+"$@"}'
-  if 0;
+#!/usr/bin/env perl
 # DESCRIPTION: Print include statements for each ARGV
 #
-# Copyright 2003-2018 by Wilson Snyder. This package is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU Lesser
-# General Public License Version 3 or the Perl Artistic License Version 2.0.
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 ######################################################################
 
 require 5.005;

bin/verilator_profcfunc

@@ -1,6 +1,4 @@
-: # -*-Mode: perl;-*- use perl, wherever it is
-eval 'exec perl -wS $0 ${1+"$@"}'
-  if 0;
+#!/usr/bin/env perl
 # See copyright, etc in below POD section.
 ######################################################################
 
@@ -24,11 +22,11 @@ my $Opt_File;
 autoflush STDOUT 1;
 autoflush STDERR 1;
 Getopt::Long::config("no_auto_abbrev");
-if (! GetOptions (
-		  "help"	=> \&usage,
-		  "debug"	=> \&debug,
-		  "<>"		=> \&parameter,
-		  )) {
+if (! GetOptions(
+          "help"        => \&usage,
+          "debug"       => \&debug,
+          "<>"          => \&parameter,
+    )) {
     die "%Error: Bad usage, try 'verilator_profcfunc --help'\n";
 }
 
@@ -39,8 +37,8 @@ profcfunc($Opt_File);
 #----------------------------------------------------------------------
 
 sub usage {
-    pod2usage(-verbose=>2, -exitval=>2, -output=>\*STDOUT);
-    exit(1);
+    pod2usage(-verbose=>2, -exitval=>0, -output=>\*STDOUT);
+    exit(1);  # Unreachable
 }
 
 sub debug {
@@ -50,9 +48,9 @@ sub debug {
 sub parameter {
     my $param = shift;
     if (!defined $Opt_File) {
-	$Opt_File = $param;
+        $Opt_File = $param;
     } else {
-	die "%Error: Unknown parameter: $param\n";
+        die "%Error: Unknown parameter: $param\n";
     }
 }
 
@@ -66,13 +64,13 @@ sub profcfunc {
     my %funcs;
 
     while (defined (my $line=$fh->getline())) {
-	#                  %time      cumesec   selfsec     calls     {stuff}   name
-	if ($line =~ /^\s*([0-9.]+)\s+[0-9.]+\s+([0-9.]+)\s+([0-9.]+)\s+[^a-zA-Z_]*([a-zA-Z_].*)$/) {
-	    my $pct=$1; my $sec=$2; my $calls=$3; my $func=$4;
-	    $funcs{$func}{pct} += $pct;
-	    $funcs{$func}{sec} += $sec;
-	    $funcs{$func}{calls} += $calls;
-	}
+        #                  %time      cumesec   selfsec     calls     {stuff}   name
+        if ($line =~ /^\s*([0-9.]+)\s+[0-9.]+\s+([0-9.]+)\s+([0-9.]+)\s+[^a-zA-Z_]*([a-zA-Z_].*)$/) {
+            my $pct=$1; my $sec=$2; my $calls=$3; my $func=$4;
+            $funcs{$func}{pct} += $pct;
+            $funcs{$func}{sec} += $sec;
+            $funcs{$func}{calls} += $calls;
+        }
         # Older gprofs have no call column for single-call functions
         #                  %time      cumesec   selfsec      {stuff}   name
         elsif ($line =~ /^\s*([0-9.]+)\s+[0-9.]+\s+([0-9.]+)\s+[^a-zA-Z_]*([a-zA-Z_].*)$/) {
@@ -88,10 +86,10 @@ sub profcfunc {
     my %pointer_mods;
     my %verilated_mods;
     foreach my $func (keys %funcs) {
-	if ($func =~ /(.*)::_eval\(([a-zA-Z_0-9]+__Syms).*\)$/) {
-	    $verilated_mods{$1} = qr/^$1/;
-	    $pointer_mods{$2} = $1;
-	}
+        if ($func =~ /(.*)::_eval\(([a-zA-Z_0-9]+__Syms).*\)$/) {
+            $verilated_mods{$1} = qr/^$1/;
+            $pointer_mods{$2} = $1;
+        }
     }
     #print Dumper(\%pointer_mods, \%verilated_mods);
 
@@ -99,72 +97,72 @@ sub profcfunc {
     my %vfuncs;
     my %groups;
     foreach my $func (keys %funcs) {
-	my $pct = $funcs{$func}{pct};
-	my $vfunc = $func;
-	my $design;
+        my $pct = $funcs{$func}{pct};
+        my $vfunc = $func;
+        my $design;
 
-	if ($func =~ /\(([a-zA-Z_0-9]+__Syms)/) {
-	    $design = $pointer_mods{$1};
-	}
+        if ($func =~ /\(([a-zA-Z_0-9]+__Syms)/) {
+            $design = $pointer_mods{$1};
+        }
 
-	foreach my $vde (keys %verilated_mods) {
-	    last if $design;
-	    if ($func =~ /$verilated_mods{$vde}/) {
-		$design=$vde;
-		last;
-	    }
-	}
+        foreach my $vde (keys %verilated_mods) {
+            last if $design;
+            if ($func =~ /$verilated_mods{$vde}/) {
+                $design=$vde;
+                last;
+            }
+        }
 
-	if ($vfunc =~ /__PROF__([a-zA-Z_0-9]+)__l?([0-9]+)\(/) {
-	    $vfunc     = sprintf("VBlock    %s:%d", $1, $2);
-	    $groups{type}{"Verilog Blocks under $design"} += $pct;
-	    $groups{design}{$design} += $pct;
-	    $groups{module}{$1} += $pct;
-	} else {
-	    if ($design) {
-		$vfunc = sprintf("VCommon   %s", $func);
-		$groups{type}{"Common code under $design"} += $pct;
-		$groups{design}{$design} += $pct;
-		$groups{module}{$design." common code"} += $pct;
-	    } elsif ($func =~ /^VL_[A-Z0-9_]+/
-		     || $func =~ /^_?vl_[a-zA-Z0-9_]+/
-		     || $func =~ /^verilated/i) {
-		$vfunc = sprintf("VLib      %s", $func);
-		$groups{type}{'VLib'} += $pct;
-		$groups{design}{'VLib'} += $pct;
-		$groups{module}{'VLib'} += $pct;
-	    } elsif ($func =~ /^_mcount_private/) {
-		$vfunc = sprintf("Prof      %s", $func);
-		$groups{type}{'Prof'} += $pct;
-		$groups{design}{'Prof'} += $pct;
-		$groups{module}{'Prof'} += $pct;
-	    } else {
-		$vfunc = sprintf("C++       %s", $func);
-		$groups{type}{'C++'} += $pct;
-		$groups{design}{'C++'} += $pct;
-		$groups{module}{'C++'} += $pct;
-	    }
-	}
-	$vfuncs{$vfunc} = $funcs{$func};
+        if ($vfunc =~ /__PROF__([a-zA-Z_0-9]+)__l?([0-9]+)\(/) {
+            $vfunc     = sprintf("VBlock    %s:%d", $1, $2);
+            $groups{type}{"Verilog Blocks under $design"} += $pct;
+            $groups{design}{$design} += $pct;
+            $groups{module}{$1} += $pct;
+        } else {
+            if ($design) {
+                $vfunc = sprintf("VCommon   %s", $func);
+                $groups{type}{"Common code under $design"} += $pct;
+                $groups{design}{$design} += $pct;
+                $groups{module}{$design." common code"} += $pct;
+            } elsif ($func =~ /^VL_[A-Z0-9_]+/
+                     || $func =~ /^_?vl_[a-zA-Z0-9_]+/
+                     || $func =~ /^verilated/i) {
+                $vfunc = sprintf("VLib      %s", $func);
+                $groups{type}{'VLib'} += $pct;
+                $groups{design}{'VLib'} += $pct;
+                $groups{module}{'VLib'} += $pct;
+            } elsif ($func =~ /^_mcount_private/) {
+                $vfunc = sprintf("Prof      %s", $func);
+                $groups{type}{'Prof'} += $pct;
+                $groups{design}{'Prof'} += $pct;
+                $groups{module}{'Prof'} += $pct;
+            } else {
+                $vfunc = sprintf("C++       %s", $func);
+                $groups{type}{'C++'} += $pct;
+                $groups{design}{'C++'} += $pct;
+                $groups{module}{'C++'} += $pct;
+            }
+        }
+        $vfuncs{$vfunc} = $funcs{$func};
     }
 
 
     foreach my $type (qw(type design module)) {
-	my $missing = 100;
-	foreach (sort (keys %{$groups{$type}})) {
-	    $missing -= $groups{$type}{$_};
-	}
-	if ($missing) {
-	    $groups{$type}{"\377Unaccounted for/rounding error"} = $missing;
-	}
+        my $missing = 100;
+        foreach (sort (keys %{$groups{$type}})) {
+            $missing -= $groups{$type}{$_};
+        }
+        if ($missing) {
+            $groups{$type}{"\377Unaccounted for/rounding error"} = $missing;
+        }
 
-	print("Overall summary by $type:\n");
-	printf("  %-6s  %s\n","% time",$type);
-	foreach my $what (sort (keys %{$groups{$type}})) {
-	    (my $pwhat = $what) =~ s/^\377//;  # Just used to establish sort order
-	    printf("  %6.2f  %s\n", $groups{$type}{$what}, $pwhat);
-	}
-	print("\n");
+        print("Overall summary by $type:\n");
+        printf("  %-6s  %s\n","% time",$type);
+        foreach my $what (sort (keys %{$groups{$type}})) {
+            (my $pwhat = $what) =~ s/^\377//;  # Just used to establish sort order
+            printf("  %6.2f  %s\n", $groups{$type}{$what}, $pwhat);
+        }
+        print("\n");
     }
 
     print("Verilog code profile:\n");
@@ -181,14 +179,14 @@ sub profcfunc {
 
     my $cume = 0;
     foreach my $func (sort {$vfuncs{$b}{sec} <=> $vfuncs{$a}{sec}
-			    || $a cmp $b}
-		      (keys %vfuncs)) {
-	$cume += $vfuncs{$func}{sec};
-	printf +("%6.2f %9.2f %8.2f %8d   %s\n",
-		 $vfuncs{$func}{pct},
-		 $cume, $vfuncs{$func}{sec},
-		 $vfuncs{$func}{calls},
-		 $func);
+                            || $a cmp $b}
+                      (keys %vfuncs)) {
+        $cume += $vfuncs{$func}{sec};
+        printf +("%6.2f %9.2f %8.2f %8d   %s\n",
+                 $vfuncs{$func}{pct},
+                 $cume, $vfuncs{$func}{sec},
+                 $vfuncs{$func}{calls},
+                 $func);
     }
 }
 
@@ -212,7 +210,7 @@ verilator_profcfunc - Read gprof report created with --prof-cfuncs
 =head1 DESCRIPTION
 
 Verilator_profcfunc reads a profile report created by gprof.  The names of
-the functions are then transformed, assuming the user used verilator's
+the functions are then transformed, assuming the user used Verilator's
 --prof-cfuncs, and a report printed showing the percentage of time, etc,
 in each Verilog block.
 
@@ -228,11 +226,14 @@ Displays this message and program version and exits.
 
 =head1 DISTRIBUTION
 
-The latest version is available from L<http://www.veripool.org/>.
+The latest version is available from L<https://verilator.org>.
 
-Copyright 2007-2018 by Wilson Snyder.  Verilator is free software; you can
-redistribute it and/or modify it under the terms of either the GNU Lesser
-General Public License Version 3 or the Perl Artistic License Version 2.0.
+Copyright 2007-2020 by Wilson Snyder. This program is free software; you
+can redistribute it and/or modify it under the terms of either the GNU
+Lesser General Public License Version 3 or the Perl Artistic License
+Version 2.0.
+
+SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
 =head1 AUTHORS
 

ci/build_vcddiff.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# DESCRIPTION: Verilator: Build script for vcddiff
+#
+# Copyright 2019 by Todd Strader. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+set -e
+
+# NB: it would be better to add this via a PPA
+
+TMP_DIR=$(mktemp -d)
+
+git -C "${TMP_DIR}" clone https://github.com/veripool/vcddiff
+VCDDIFF_DIR=${TMP_DIR}/vcddiff
+git -C "${VCDDIFF_DIR}" checkout 5112f88b7ba8818dce9dfb72619e64a1fc19542c
+make -C "${VCDDIFF_DIR}"
+sudo cp "${VCDDIFF_DIR}/vcddiff" /usr/local/bin

ci/build_verilator.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+# DESCRIPTION: Verilator: Travis CI build script
+#
+# Copyright 2019 by Todd Strader. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+# This script builds and caches the Verilator binaries for Travis CI
+# (and possibly other CI platforms).  The Verilator CI system uses this
+# script, but other CI systems that depend on Verilator may also use
+# the script.
+# see: https://github.com/verilator/verilator_ext_tests/blob/master/.travis.yml
+# To use this script, either checkout Verilator as part of the CI build
+# process or add Verilator as a Git submodule.  Verilator tarballs can
+# not be used as the script relies on Git revisions for caching.
+set -e
+
+if [ -z "${VERILATOR_NUM_JOBS}" ]; then
+    VERILATOR_NUM_JOBS=$(nproc)
+fi
+
+# Caching would be simpler if we installed without VERILATOR_ROOT, but
+#   it's needed for driver.pl outside of the repo
+if [ -z "${VERILATOR_ROOT}" ]; then
+    echo "VERILATOR_ROOT not set"
+    exit -1
+fi
+
+if [ -z "${VERILATOR_CACHE}" ]; then
+    echo "VERILATOR_CACHE not set"
+    exit -1
+fi
+
+VERILATOR_REV=$(cd "${VERILATOR_ROOT}" && git rev-parse HEAD)
+echo "Found Verilator rev ${VERILATOR_REV}"
+
+CACHED_REV_FILE=${VERILATOR_CACHE}/.rev.txt
+
+if [[ ! -f "${CACHED_REV_FILE}" || \
+      $(< "${CACHED_REV_FILE}") != "${VERILATOR_REV}" ]]; then
+    echo "Building Verilator"
+
+    # Unsure why Travis monkies with the capitalization of the stage name, but it does
+    if [[ -n ${TRAVIS_BUILD_STAGE_NAME} && \
+         ${TRAVIS_BUILD_STAGE_NAME} != "Build verilator" ]]; then
+      echo "WARNING: Building Verilator in Travis build stage other than \"Build verilator\": ${TRAVIS_BUILD_STAGE_NAME}"
+    fi
+
+    cd "${VERILATOR_ROOT}"
+    autoconf && ./configure ${VERILATOR_CONFIG_FLAGS} && make -j ${VERILATOR_NUM_JOBS}
+    # Copy the Verilator build artifacts
+    mkdir -p "${VERILATOR_CACHE}"
+    rm -rf ${VERILATOR_CACHE}/*
+    cp bin/*bin* "${VERILATOR_CACHE}"
+    # Remember the Git revision
+    echo "${VERILATOR_REV}" > "${CACHED_REV_FILE}"
+else
+    echo "Using cached Verilator"
+    cd "${VERILATOR_ROOT}"
+    # Create include/verilated_config.h and maybe other things
+    autoconf && ./configure ${VERILATOR_CONFIG_FLAGS}
+    cp ${VERILATOR_CACHE}/* bin
+fi

ci/docker/buildenv/Dockerfile

@@ -0,0 +1,58 @@
+# DESCRIPTION: Dockerfile for env to build and fully test Verilator
+#
+# Copyright 2020 by Stefan Wallentowitz. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+FROM ubuntu:18.04
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive \
+       apt-get install --no-install-recommends -y \
+                        autoconf=2.69-11 \
+                        bc=1.07.1-2 \
+                        bison=2:3.0.4.dfsg-1build1 \
+                        build-essential=12.4ubuntu1 \
+                        ca-certificates=20180409 \
+                        cmake=3.10.2-1ubuntu2.18.04.1 \
+                        flex=2.6.4-6 \
+                        gdb=8.1-0ubuntu3.2 \
+                        gcc-6=6.5.0-2ubuntu1~18.04 \
+                        gcc-5=5.5.0-12ubuntu1 \
+                        gcc-4.8=4.8.5-4ubuntu8 \
+                        git=1:2.17.1-1ubuntu0.5 \
+                        gtkwave=3.3.86-1 \
+                        g++-6=6.5.0-2ubuntu1~18.04 \
+                        g++-5=5.5.0-12ubuntu1 \
+                        g++-4.8=4.8.5-4ubuntu8 \
+                        libfl2=2.6.4-6 \
+                        libfl-dev=2.6.4-6 \
+                        numactl=2.0.11-2.1ubuntu0.1 \
+                        perl=5.26.1-6ubuntu0.3 \
+                        python3=3.6.7-1~18.04 \
+                        wget=1.19.4-1ubuntu2.2 \
+                        zlibc=0.9k-4.3 \
+                        zlib1g=1:1.2.11.dfsg-0ubuntu2 \
+                        zlib1g-dev=1:1.2.11.dfsg-0ubuntu2 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /tmp
+
+COPY build-systemc.sh /tmp/
+RUN ./build-systemc.sh
+
+RUN cpan install -fi Unix::Processors Parallel::Forker Bit::Vector
+
+RUN git clone https://github.com/veripool/vcddiff.git && \
+    make -C vcddiff && \
+    cp -p vcddiff/vcddiff /usr/local/bin/vcddiff && \
+    rm -rf vcddiff
+
+COPY build.sh /tmp/build.sh
+
+ENV VERILATOR_AUTHOR_SITE=1
+
+ENTRYPOINT [ "/tmp/build.sh" ]

ci/docker/buildenv/README.adoc

@@ -0,0 +1,49 @@
+= Verilator Docker Build Environment
+
+This Verilator Build container is set up to compile and test a Verilator
+build. It uses the following parameters:
+
+* Source repository (default: https://github.com/verilator/verilator)
+* Source revision (default: master)
+* GCC version (4.8.5, 5.5.0, 6.5.0, 7.4.0, default: 7.4.0)
+
+The container is published as `verilator/verilator-buildenv` on
+https://hub.docker.com/repository/docker/verilator/verilator-buildenv[docker hub].
+
+To run the basic build using the current Verilator master:
+
+    docker run -ti verilator/verilator-buildenv
+
+To also run tests:
+
+    docker run -ti verilator/verilator-buildenv test
+
+To change the compiler:
+
+    docker run -ti -e CC=gcc-4.8 -e CXX=g++-4.8 verilator/verilator-buildenv test
+
+The tests that involve gdb are not working due to security restrictions.
+To run those too:
+
+....
+docker run -ti -v ${PWD}:/tmp/repo -e REPO=/tmp/repo -e REV=`git rev-parse --short HEAD` -e CC=gcc-4.8 -e CXX=g++-4.8 --cap-add=SYS_PTRACE --security-opt seccomp=unconfined verilator/verilator-buildenv test
+....
+
+Rather then building using a remote git repository you may prefer to use a
+working copy on the local filesystem. Mount the local working copy path as
+a volume and use that in place of git. When doing this be careful to have
+all changes committed to the local git area. To build the current HEAD from
+top of a repository:
+
+....
+docker run -ti -v ${PWD}:/tmp/repo -e REPO=/tmp/repo -e REV=`git rev-parse --short HEAD` --cap-add=SYS_PTRACE --security-opt seccomp=unconfined verilator/verilator-buildenv test
+....
+
+== Rebuilding
+
+To rebuild the Verilator-buildenv docker image, run:
+
+    docker build .
+
+This will also build SystemC under all supported compiler variants to
+reduce the SystemC testing time.

ci/docker/buildenv/build-systemc.sh

@@ -0,0 +1,30 @@
+#!/bin/bash -e
+# DESCRIPTION: Build SystemC in Ubuntu 18.04 with  different g++/gcc
+#
+# Copyright 2020 by Stefan Wallentowitz. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+build_variant () {
+    version=$($1 --version | grep gcc | awk '{print $4}')
+    mkdir "/usr/local/systemc-2.3.3-gcc$version"
+    mkdir build
+    cd build
+    ../configure --prefix="/usr/local/systemc-2.3.3-gcc$version" CC="$1" CXX="$2" LD="$2"
+    make -j
+    make install
+    cd ..
+    rm -r build
+}
+
+wget https://www.accellera.org/images/downloads/standards/systemc/systemc-2.3.3.tar.gz
+tar -xzf systemc-2.3.3.tar.gz
+cd systemc-2.3.3
+build_variant gcc g++
+build_variant gcc-6 g++-6
+build_variant gcc-5 g++-5
+build_variant gcc-4.8 g++-4.8
+cd ..
+rm -r systemc-2.3.3*

ci/docker/buildenv/build.sh

@@ -0,0 +1,31 @@
+#!/bin/bash -e
+# DESCRIPTION: Build Verilator (inside container)
+#
+# Copyright 2020 by Stefan Wallentowitz. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+: "${REPO:=https://github.com/verilator/verilator}"
+: "${REV:=master}"
+: "${CC:=gcc}"
+: "${CXX:=g++}"
+
+GCCVERSION=$(${CC} --version | grep gcc | awk '{print $4}')
+
+export SYSTEMC_INCLUDE="/usr/local/systemc-2.3.3-gcc${GCCVERSION}/include"
+export SYSTEMC_LIBDIR="/usr/local/systemc-2.3.3-gcc${GCCVERSION}/lib-linux64"
+export LD_LIBRARY_PATH=${SYSTEMC_LIBDIR}
+
+SRCS=$PWD/verilator
+
+git clone "$REPO" "$SRCS"
+cd "$SRCS"
+git checkout "$REV"
+autoconf
+./configure --enable-longtests
+make -j $(nproc)
+if [ "${1:-''}" == "test" ]; then
+    make test
+fi

ci/docker/run/Dockerfile

@@ -0,0 +1,50 @@
+# DESCRIPTION: Dockerfile for image to run Verilator inside
+#
+# Copyright 2020 by Stefan Wallentowitz. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+FROM ubuntu:18.04
+
+RUN apt-get update \
+    && apt-get install --no-install-recommends -y \
+                        autoconf=2.69-11 \
+                        bc=1.07.1-2 \
+                        bison=2:3.0.4.dfsg-1build1 \
+                        build-essential=12.4ubuntu1 \
+                        ca-certificates=20180409 \
+                        ccache \
+                        flex=2.6.4-6 \
+                        git \
+                        libfl-dev=2.6.4-6 \
+                        libgoogle-perftools-dev \
+                        perl \
+                        python3 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+ARG REPO=https://github.com/verilator/verilator
+ARG SOURCE_COMMIT=master
+
+WORKDIR /tmp
+
+# Add an exception for the linter, we want to cd here in one layer
+# to reduce the number of layers (and thereby size).
+# hadolint ignore=DL3003
+RUN git clone "${REPO}" verilator && \
+    cd verilator && \
+    git checkout "${SOURCE_COMMIT}" && \
+    autoconf && \
+    ./configure && \
+    make -j "$(nproc)" && \
+    make install && \
+    cd .. && \
+    rm -r verilator
+
+COPY verilator-wrap.sh /usr/local/bin/verilator-wrap.sh
+
+WORKDIR /work
+
+ENTRYPOINT [ "/usr/local/bin/verilator-wrap.sh" ]

ci/docker/run/README.adoc

@@ -0,0 +1,59 @@
+= Verilator Executable Docker Container
+
+The Verilator Executable Docker Container allows you to run Verilator
+easily as a docker image, e.g.:
+
+    docker run -ti verilator/verilator:latest --version
+
+This will install the container, run the latest Verilator and print
+Verilator's version.
+
+Containers are automatically built for all released versions, so you may
+easily compare results across versions, e.g.:
+
+    docker run -ti verilator/verilator:4.030 --version
+
+Verilator needs to read and write files on the local system.  To simplify
+this process, use the `verilator-docker` convenience script.  This script
+takes the version number, and all remaining arguments are passed through to
+Verilator. e.g.:
+
+    ./verilator-docker 4.030 --version
+
+or
+
+    ./verilator-docker 4.030 --cc test.v
+
+If you prefer not to use `verilator-docker` you must give the container
+access to your files as a volume with appropriate user rights.  For example
+to Verilate test.v:
+
+....
+docker run -ti -v ${PWD}:/work --user $(id -u):$(id -g) verilator/verilator:latest --cc test.v
+....
+
+This method can only access files below the current directory. An
+alternative is setup the volume `-workdir`.
+
+You can also work in the container by setting the entrypoint
+(don't forget to mount a volume if you want your work persistent):
+
+    docker run -ti --entrypoint /bin/bash verilator/verilator:latest
+
+You can also use the container to build Verilator at a specific
+commit:
+
+    docker build --build-arg SOURCE_COMMIT=<commit> .
+
+== Internals
+
+The Dockerfile builds Verilator and removes the tree when completed to
+reduce the image size. The entrypoint is set as a wrapper script
+(`verilator-wrap.sh`).  That script 1. calls Verilator, and 2. copies the
+Verilated runtime files to the `obj_dir` or the `-Mdir` respectively. This
+allows the user to have the files to they may later build the C++ output
+with the matching runtime files. The wrapper also patches the Verilated
+Makefile accordingly.
+
+There is also a hook defined that is run by docker hub via automated
+builds.

ci/docker/run/hooks/build

@@ -0,0 +1,10 @@
+#!/bin/bash
+# DESCRIPTION: Docker hub hook to pass SOURCE_COMMIT
+#
+# Copyright 2020 by Stefan Wallentowitz. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+docker build --build-arg SOURCE_COMMIT=${SOURCE_COMMIT} -f $DOCKERFILE_PATH -t $IMAGE_NAME .

ci/docker/run/hooks/post_push

@@ -0,0 +1,13 @@
+#!/bin/bash
+# DESCRIPTION: Docker hub hook to tag the latest release (stable)
+#
+# Copyright 2020 by Stefan Wallentowitz. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+if [ "$SOURCE_BRANCH"="stable" ]; then
+    docker tag $IMAGE_NAME $DOCKER_REPO:latest
+    docker push $DOCKER_REPO:latest
+fi

ci/docker/run/verilator-docker

@@ -0,0 +1,11 @@
+#!/bin/bash
+# DESCRIPTION: Wrap a verilator call to run a docker container
+#
+# Copyright 2020 by Stefan Wallentowitz. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+docker pull verilator/verilator:$1 >/dev/null
+docker run -ti -v ${PWD}:/work --user $(id -u):$(id -g) verilator/verilator:$1 "${@:2}"

ci/docker/run/verilator-wrap.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# DESCRIPTION: Wrap a Verilator call and copy vlt includes
+#              (inside docker container)
+#
+# Copyright 2020 by Stefan Wallentowitz. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+perl /usr/local/bin/verilator "$@"
+status=$?
+if [ $status -ne 0 ]; then
+    exit $status
+fi
+
+# Check if user set an obj_dir
+obj_dir=$(echo " $@" | grep -oP '\s--Mdir\s*\K\S+')
+if [ "$obj_dir" == "" ]; then
+    obj_dir="obj_dir"
+fi
+
+# If the run was successful: Copy required files to allow build without this container
+if [ -e ${obj_dir} ]; then
+    # Copy files required for the build
+    mkdir -p ${obj_dir}/vlt
+    cp -r /usr/local/share/verilator/bin ${obj_dir}/vlt
+    cp -r /usr/local/share/verilator/include ${obj_dir}/vlt
+    # Point Makefile to that folder
+    perl -i -pe 's/VERILATOR_ROOT = \/usr\/local\/share\/verilator/VERILATOR_ROOT = vlt/g' ${obj_dir}/*.mk
+fi

ci/test.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+# DESCRIPTION: Verilator: Travis CI test script
+#
+# Copyright 2019 by Todd Strader. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+set -e
+
+export DRIVER_FLAGS='-j 0 --quiet --rerun'
+
+case $1 in
+    dist)
+        make -C test_regress SCENARIOS=--dist
+        ;;
+    vlt)
+        make -C test_regress SCENARIOS=--vlt
+        ;;
+    vltmt)
+        make -C test_regress SCENARIOS=--vltmt
+        ;;
+    vltmt0)
+        make -C test_regress SCENARIOS=--vltmt DRIVER_HASHSET=--hashset=0/2
+        ;;
+    vltmt1)
+        make -C test_regress SCENARIOS=--vltmt DRIVER_HASHSET=--hashset=1/2
+        ;;
+    *)
+    echo "Usage: test.sh (dist|vlt|vltmt)"
+    exit -1
+    ;;
+esac

configure.ac

@@ -1,19 +1,20 @@
 # DESCRIPTION: Process this file with autoconf to produce a configure script.
 #
-# Copyright 2003-2018 by Wilson Snyder. Verilator is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU Lesser
+# Copyright 2003-2020 by Wilson Snyder. Verilator is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU Lesser
 # General Public License Version 3 or the Perl Artistic License Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
 #AC_INIT([Verilator],[#.### YYYY-MM-DD])
 #AC_INIT([Verilator],[#.### devel])
-AC_INIT([Verilator],[4.008 2018-12-01],
-        [https://www.veripool.org/verilator],
-        [verilator],[https://www.veripool.org/verilator])
+AC_INIT([Verilator],[4.034 2020-05-03],
+        [https://verilator.org],
+        [verilator],[https://verilator.org])
 # When releasing, also update header of Changes file
 # and commit using "devel release" or "Version bump" message
 
 AC_CONFIG_HEADER(src/config_build.h)
-AC_CONFIG_FILES(Makefile src/Makefile src/Makefile_obj include/verilated.mk include/verilated_config.h verilator.pc)
+AC_CONFIG_FILES(Makefile docs/Makefile src/Makefile src/Makefile_obj include/verilated.mk include/verilated_config.h verilator.pc verilator-config.cmake verilator-config-version.cmake)
 
 AC_MSG_RESULT([configuring for $PACKAGE_STRING])
 
@@ -25,11 +26,43 @@ AC_ARG_ENABLE([maintainer-mode],
 AC_ARG_ENABLE([silent-rules],
               [AS_HELP_STRING([--disable-silent-rules], [ignored])])
 
+# Flag to enable linking specific libraries statically
+AC_MSG_CHECKING(whether to perform partial static linking of Verilator binary)
+AC_ARG_ENABLE([partial-static],
+              [AS_HELP_STRING([--disable-partial-static],
+                              [By default, for Verilation peformance, Verilator
+                               is linked against some of its dependencies
+                               statically. Use this to link the Verilator binary
+                               fully dynamically.])],
+              [case "${enableval}" in
+                yes) CFG_ENABLE_PARTIAL_STATIC=yes ;;
+                no)  CFG_ENABLE_PARTIAL_STATIC=no ;;
+                *)   AC_MSG_ERROR([bad value '${enableval}' for --disable-partial-static]) ;;
+               esac],
+               CFG_ENABLE_PARTIAL_STATIC=yes)
+AC_MSG_RESULT($CFG_ENABLE_PARTIAL_STATIC)
+
+# Flag to enable linking Verilator with tcmalloc if available
+AC_MSG_CHECKING(whether to use tcmalloc)
+AC_ARG_ENABLE([tcmalloc],
+              [AS_HELP_STRING([--enable-tcmalloc],
+                              [Use libtcmalloc_minimal for faster dynamic memory
+                               management in Verilator binary@<:@default=check@:>@])],
+              [case "${enableval}" in
+                yes) CFG_WITH_TCMALLOC=yes ;;
+                no)  CFG_WITH_TCMALLOC=no ;;
+                *)   AC_MSG_ERROR([bad value '${enableval}' for --enable-tcmalloc]) ;;
+               esac],
+              [CFG_WITH_TCMALLOC=check;])
+AC_MSG_RESULT($CFG_WITH_TCMALLOC)
+
 # Special Substitutions - CFG_WITH_DEFENV
 AC_MSG_CHECKING(whether to use hardcoded paths)
 AC_ARG_ENABLE([defenv],
               [AS_HELP_STRING([--disable-defenv],
-                              [disable using some hardcoded data paths extracted from some default environment variables (the default is to use hardcoded paths)])],
+                              [disable using some hardcoded data paths extracted
+                              from some default environment variables (the default
+                              is to use hardcoded paths) in Verilator binary])],
               [case "${enableval}" in
                 yes) CFG_WITH_DEFENV=yes ;;
                 no)  CFG_WITH_DEFENV=no ;;
@@ -43,7 +76,8 @@ AC_MSG_RESULT($CFG_WITH_DEFENV)
 AC_MSG_CHECKING(whether to show and stop on compilation warnings)
 AC_ARG_ENABLE([ccwarn],
               [AS_HELP_STRING([--enable-ccwarn],
-                              [enable showing and stopping on compilation warnings])],
+                              [enable showing and stopping on compilation warnings
+                               in Verilator binrary and Verilated makefiles])],
               [case "${enableval}" in
                 yes) CFG_WITH_CCWARN=yes ;;
                 no)  CFG_WITH_CCWARN=no ;;
@@ -79,7 +113,8 @@ AC_MSG_RESULT($CFG_WITH_LONGTESTS)
 AC_MSG_CHECKING(whether allow pre-C++11)
 AC_ARG_ENABLE([prec11],
               [AS_HELP_STRING([--enable-prec11],
-                              [enable pre-C++11 compilers])],
+                              [enable pre-C++11 compilers for Verilator binary
+                               and Verilated makefiles])],
               [case "${enableval}" in
                 yes) CFG_WITH_PREC11=yes ;;
                 no)  CFG_WITH_PREC11=no ;;
@@ -91,10 +126,10 @@ AC_SUBST(CFG_WITH_PREC11)
 AC_MSG_RESULT($CFG_WITH_PREC11)
 
 # Compiler flags
-CFLAGS=-I${includedir}
-CPPFLAGS=-I${includedir}
-CXXFLAGS=-I${includedir}
-LDFLAGS=-L${libdir}
+CFLAGS+=" -I${includedir}"
+CPPFLAGS+=" -I${includedir}"
+CXXFLAGS+=" -I${includedir}"
+LDFLAGS+=" -L${libdir}"
 
 # Checks for programs.
 AC_PROG_CC
@@ -124,6 +159,12 @@ if test "x$YACC" = "x" ; then
    AC_MSG_ERROR([Cannot find "bison" in your PATH, please install it])
 fi
 
+AC_CHECK_PROG(OBJCACHE,ccache,ccache)
+if test "x$OBJCACHE" != "x" ; then
+  objcache_version=$($OBJCACHE --version | head -1)
+  AC_MSG_RESULT([objcache is $OBJCACHE --version = $objcache_version])
+fi
+
 # Checks for libraries.
 
 # Checks for typedefs, structures
@@ -209,15 +250,26 @@ AC_DEFUN([_MY_LDLIBS_CHECK_FLAG],
     LIBS="$ACO_SAVE_LIBS"
    ])
 
-AC_DEFUN([_MY_LDLIBS_CHECK_OPT],
-   [# _MY_LDLIBS_CHECK_OPT(flag) -- Check if linker supports specific options
-    # If it does, append flag to variable
-    _MY_LDLIBS_CHECK_FLAG($2)
+AC_DEFUN([_MY_LDLIBS_CHECK_IFELSE],
+   [# _MY_LDLIBS_CHECK_IFELSE(flag,action-if-supported,action-if-not-supported)
+    # Check if linker supports specific flag, if it does do action-if-supported
+    # otherwise do action-if-not-supported
+    _MY_LDLIBS_CHECK_FLAG($1)
     if test "$_my_result" = "yes" ; then
-       $1="$$1 $2"
+      true
+      $2
+    else
+      true
+      $3
     fi
    ])
 
+AC_DEFUN([_MY_LDLIBS_CHECK_OPT],
+   [# _MY_LDLIBS_CHECK_OPT(variable, flag) -- Check if linker supports specific
+    # options. If it does, append flag to variable.
+    _MY_LDLIBS_CHECK_IFELSE($2, $1="$$1 $2")
+   ])
+
 # Flag to select newest language standard supported
 # Macros work such that first option that passes is the one we take
 # gnu++17 code is clean, but SystemC in 2018 doesn't link with it (bug1339)
@@ -256,7 +308,6 @@ AC_SUBST(CFG_CXXFLAGS_WEXTRA)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Qunused-arguments)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-faligned-new)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Wno-unused-parameter)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Wno-undefined-bool-conversion)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Wno-shadow)
 AC_SUBST(CFG_CXXFLAGS_SRC)
 
@@ -273,25 +324,81 @@ AC_SUBST(CFG_CXXFLAGS_PARSER)
 # without this flag, even though there's a conditional to prevent the divide.
 # We still don't add no-div-by-zero as it throws message to stdout, though doesn't die.
 #_MY_CXX_CHECK_OPT(-Wno-div-by-zero)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-faligned-new)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-fbracket-depth=4096)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Qunused-arguments)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-bool-operation)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-parentheses-equality)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-sign-compare)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-uninitialized)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-unused-but-set-variable)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-unused-parameter)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-unused-variable)
-_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-shadow)
+# For some reason -faligned-new does not work under Travis w/ clang but the
+# configure test doesn't catch this either
+AS_IF([test "x$TRAVIS_COMPILER" != xclang], [_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-faligned-new)])
+CFG_CXX_FLAGS_CMAKE="-faligned-new"
+m4_foreach([cflag],[
+        [-fbracket-depth=4096],
+        [-fcf-protection=none],
+        [-mno-cet],
+        [-Qunused-arguments],
+        [-Wno-bool-operation],
+        [-Wno-tautological-bitwise-compare],
+        [-Wno-parentheses-equality],
+        [-Wno-sign-compare],
+        [-Wno-uninitialized],
+        [-Wno-unused-but-set-variable],
+        [-Wno-unused-parameter],
+        [-Wno-unused-variable],
+        [-Wno-shadow]],[
+    _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,cflag)
+    # CMake will test what flags work itself, so pass all flags through to it
+    CFG_CXX_FLAGS_CMAKE="$CFG_CXX_FLAGS_CMAKE cflag"
+    ])
 AC_SUBST(CFG_CXXFLAGS_NO_UNUSED)
+AC_SUBST(CFG_CXX_FLAGS_CMAKE)
 
 # Find multithread linker flags
-_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,-mt)
-_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,-pthread)
-_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,-lpthread)
-_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,-latomic)
+m4_foreach([ldflag], [
+        [-mt],
+        [-pthread],
+        [-lpthread],
+        [-latomic]],[
+    _MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,ldflag)
+    # CMake will test what flags work itself, so pass all flags through to it
+    CFG_LDFLAGS_THREADS_CMAKE="$CFG_LDFLAGS_THREADS_CMAKE ldflag"
+    ])
 AC_SUBST(CFG_LDLIBS_THREADS)
+AC_SUBST(CFG_LDFLAGS_THREADS_CMAKE)
+
+# When linking partially statically
+if test "$CFG_ENABLE_PARTIAL_STATIC" = "yes"; then
+  _MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_SRC, -static-libgcc)
+  _MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_SRC, -static-libstdc++)
+  _MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_SRC, -Xlinker -gc-sections)
+  LTCMALLOC=-l:libtcmalloc_minimal.a
+else
+  LTCMALLOC=-ltcmalloc_minimal
+fi
+AC_SUBST(CFG_LDFLAGS_SRC)
+
+# The pthread library is required by tcmalloc, so add it if it exists. If it
+# does not, the tcmalloc check below will fail anyway, and linking against
+# pthreads is harmless otherwise.
+CFG_LIBS="$LIBS $CFG_LIBS"
+_MY_LDLIBS_CHECK_OPT(CFG_LIBS, -lpthread)
+
+# Check libraries for MingW
+_MY_LDLIBS_CHECK_OPT(CFG_LIBS, -lbcrypt)
+_MY_LDLIBS_CHECK_OPT(CFG_LIBS, -lpsapi)
+
+# Check if tcmalloc is available based on --enable-tcmalloc
+_MY_LDLIBS_CHECK_IFELSE(
+  $LTCMALLOC,
+  [if test "$CFG_WITH_TCMALLOC" != "no"; then
+    CFG_LIBS="$LTCMALLOC $CFG_LIBS";
+    # If using tcmalloc, add some extra options to make the compiler not assume
+    # it is using it's own versions of the standard library functions
+    _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-fno-builtin-malloc)
+    _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-fno-builtin-calloc)
+    _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-fno-builtin-realloc)
+    _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-fno-builtin-free)
+   fi],
+  [if test "$CFG_WITH_TCMALLOC" = "yes"; then
+    AC_MSG_ERROR([--enable-tcmalloc was given but test for ${LTCMALLOC} failed])
+   fi])
+AC_SUBST(CFG_LIBS)
 
 # Set CFG_WITH_THREADED if can support threading
 AC_MSG_CHECKING(whether $CXX supports Verilated threads)

docs/.gitignore

@@ -0,0 +1,4 @@
+*.1
+*.html
+*.pdf
+Makefile

docs/CONTRIBUTING.adoc

@@ -0,0 +1,82 @@
+= How to contribute to Verilator
+
+Thanks for using Verilator!  We welcome your contributions in whatever form.
+
+This contributing document contains some suggestions that may make
+contributions flow more efficiently.
+
+==== Did you find a bug?
+
+* Please **Ensure the bug was not already reported** by searching
+  https://verilator.org/issues[Verilator Issues].
+
+* If you're unable to find an open issue addressing the problem,
+  https://verilator.org/issues/new[open a new Verilator issue].
+
+** Be sure to include a **code sample** or an **executable test case**
+   demonstrating the bug and expected behavior that is not occurring.
+
+** The ideal example works against other simulators, and is in the
+   test_regress/t test format, as described in
+   link:internals.adoc[docs/internals].
+
+==== Did you write a patch that fixes a bug?
+
+* Please https://verilator.org/issues/new[Open a new issue].
+
+* You may attach a patch to the issue, or (preferred) may request a GitHub
+  pull request.
+
+** Verilator uses Travis CI to provide continuous integration. You may
+   want to setup Travis CI on your GitHub branch to ensure your changes
+   keep the tests passing.  See link:internals.adoc[docs/internals].
+
+* Your source-code contributions must be certified as open source, under
+  the https://developercertificate.org/[Developer Certificate of
+  Origin]. On your first contribution, you must either:
+
+** Have your patch include the addition of your name to
+   link:CONTRIBUTORS[docs/CONTRIBUTORS] (preferred).
+
+** Use "git -s" as part of your commit. This adds a "signed-of-by"
+   attribute which will certify your contribution as described in the
+   https://github.com/wking/signed-off-by/blob/master/Documentation/SubmittingPatches[Signed-of-By
+   convention].
+
+** Email, or post in an issue a statement that you certify your
+   contributions.
+
+** In any of these cases your name will be added to
+   link:CONTRIBUTORS[docs/CONTRIBUTORS] and you are agreeing all future
+   contributions are also certified.
+
+** We occasionally accept contributions where people do not want their name
+   published. Please email us; you must still privately certify your
+   contribution.
+
+* Your test contributions are generally considered released into the
+  Creative Commons Public Domain (CC0), unless you request otherwise or put
+  a GNU/Artistic license on your file.
+
+* Most important is we get your patch. If you'd like to clean up
+  indentation and related issues ahead of our feedback, that is
+  appreciated; please see the coding conventions in
+  link:internals.adoc[docs/internals].
+
+==== Do you have questions?
+
+* Please see FAQ section and rest of the
+  https://verilator.org/verilator_doc.html[Verilator manual],
+  or https://verilator.org/verilator_doc.pdf[Verilator manual (PDF)].
+
+* Ask any question in the
+  https://verilator.org/forum[Verilator forum].
+
+==== Code of Conduct
+
+* Our contributors and participants pledge to make participation in our
+  project and our community a positive experience for everyone.  We follow
+  the https://www.contributor-covenant.org/version/1/4/code-of-conduct.html[Contributor
+  Covenant version 1.4].
+
+Thanks!

docs/CONTRIBUTORS

@@ -0,0 +1,49 @@
+The contributors listed below have certified their Verilator contributions
+under the Developer Certificate of Origin (https://developercertificate.org/).
+
+Please see the Verilator manual for 200+ additional contributors. Thanks to all.
+
+Ahmed El-Mahmoudy
+Alex Chadwick
+Chris Randall
+David Stanford
+Driss Hafdi
+Eric Rippey
+Garrett Smith
+Geza Lore
+Gianfranco Costamagna
+Howard Su
+Iztok Jeras
+James Hanlon
+Jeremy Bennett
+John Coiner
+John Demme
+Julien Margetts
+Kanad Kanhere
+Kevin Kiningham
+Kuba Ober
+Lukasz Dalek
+Maarten De Braekeleer
+Maciej Sobkowski
+Marco Widmer
+Matthew Ballance
+Mike Popoloski
+Nathan Kohagen
+Nathan Myers
+Patrick Stewart
+Peter Horvath
+Peter Monsson
+Philipp Wagner
+Pieter Kapsenberg
+Qingyao Sun
+Richard Myers
+Sean Cross
+Sebastien Van Cauwenberghe
+Stefan Wallentowitz
+Tobias Rosenkranz
+Tobias Wölfel
+Todd Strader
+Veripool API Bot
+Wilson Snyder
+Yutetsu TAKATSUKASA
+Yves Mathieu

docs/Makefile.in

@@ -0,0 +1,50 @@
+#*****************************************************************************
+# DESCRIPTION: Verilator documentation: Makefile pre-configure version
+#
+# This file is part of Verilator.
+#
+# Code available from: https://verilator.org
+#
+#*****************************************************************************
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+#****************************************************************************/
+#
+# This file is intended only to be called from the top-level Verilator Makefile.
+
+#### Start of system configuration section. ####
+
+ASCIIDOCTOR = asciidoctor
+DOXYGEN = doxygen
+
+#### End of system configuration section. ####
+######################################################################
+
+.SUFFIXES:
+
+default:
+	@echo "error: make not supported here, run 'make docs' from Verilator top-level"
+
+%.html: %.adoc
+	$(ASCIIDOCTOR) $< -n -o $@
+
+clean mostlyclean distclean maintainer-clean::
+	rm -f $(SCRIPTS) *.tmp
+	rm -f *.aux *.cp *.cps *.dvi *.fn *.fns *.ky *.kys *.log
+	rm -f *.pg *.pgs *.toc *.tp *.tps *.vr *.vrs *.idx
+	rm -f *.ev *.evs *.ov *.ovs *.cv *.cvs *.ma *.mas
+	rm -f *.tex
+
+distclean maintainer-clean::
+	rm -f *.info* *.1 *.html *.pdf $(INFOS)
+	rm -f Makefile
+
+.PHONY: doxygen
+
+doxygen:
+	$(DOXYGEN) doxygen.config

docs/TODO

@@ -1,9 +1,10 @@
 // DESCRIPTION: Verilator: List of To Do issues.
 //
-// Copyright 2004-2018 by Wilson Snyder. This program is free software; you can
+// Copyright 2004-2020 by Wilson Snyder. This program is free software; you can
 // redistribute it and/or modify it under the terms of either the GNU
 // Lesser General Public License Version 3 or the Perl Artistic License
 // Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
 * Language support:
 ** Fix ordering of each bit separately in a signal (mips)
@@ -22,17 +23,10 @@
 ** Assertions
 ** Tristate support
 
-* Configure/Make/Install
-** Distribute with flex/bison already expanded?
-   Flex library not needed.  Probably too difficult to be worth it.
-
 * Testing:
-** Capture all inputs into global "rerun it" file
 ** Code to make wrapper that sets signals, so can do comparison checks
 ** New random program generator
 ** Better graph viewer with search and zoom
-** Port and test against opencores.org code
-** // verilator debug in code so can see only tree affecting those nodes
 
 * Usability:
 ** Detect and pre-remove most UNOPTFLATs

docs/doxygen-mainpage

@@ -3,4 +3,4 @@
  * \section intro_sec Introduction
  *
  * This is a full doxygen analysis of the Verilator source tree.
- */
+ */

docs/doxygen.config

@@ -45,7 +45,7 @@ PROJECT_BRIEF          = "Verilog to C translator"
 # exceed 55 pixels and the maximum width should not exceed 200 pixels.
 # Doxygen will copy the logo to the output directory.
 
-PROJECT_LOGO           = veripool-logo.png
+PROJECT_LOGO           = verilator_logo.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.

docs/install.adoc

@@ -0,0 +1,308 @@
+= Verilator Installation
+:toc: right
+
+// Github doesn't render unless absolute URL
+image::https://www.veripool.org/img/verilator_256_200_min.png[Logo,256,200,role="right"]
+
+== Introduction
+
+This discusses how to install Verilator.  For more general information
+please see https://verilator.org[verilator.org].
+
+== Quick-start
+
+=== Install From a Package Manager
+
+Using a distribution's package manager is the easiest way to get
+started. (Note packages are unlikely to have the most recent version, so
+Git, below, maybe a better alternative.) To install as a package:
+
+   apt-get install verilator
+
+If this works, skip down to <<Running Verilator>>.
+
+=== Docker
+
+Verilator is available in pre-built Docker containers. See
+https://github.com/verilator/verilator/blob/master/ci/docker/run/README.adoc
+
+=== Git
+
+Installing Verilator with Git provides the most flexibility.
+For additional options and details see the additional sections below.  In
+brief:
+
+// Also update README
+....
+# Prerequisites:
+#sudo apt-get install git make autoconf g++ flex bison
+#sudo apt-get install libfl2  # Ubuntu only (ignore if gives error)
+#sudo apt-get install libfl-dev  # Ubuntu only (ignore if gives error)
+
+git clone https://git.veripool.org/git/verilator   # Only first time
+## Note the URL above is not a page you can see with a browser, it's for git only
+
+# Every time you need to build:
+unsetenv VERILATOR_ROOT  # For csh; ignore error if on bash
+unset VERILATOR_ROOT  # For bash
+cd verilator
+git pull        # Make sure git repository is up-to-date
+git tag         # See what versions exist
+#git checkout master      # Use development branch (e.g. recent bug fixes)
+#git checkout stable      # Use most recent stable release
+#git checkout v{version}  # Switch to specified release version
+
+autoconf        # Create ./configure script
+./configure
+make
+sudo make install
+# Now see "man verilator" or online verilator.pdf's for the example tutorials
+....
+
+If this works, skip down to <<Running Verilator>>.
+
+== Detailed Build Instructions
+
+This section describes details of the build process, and assumes you are
+building from Git or a tarball.  For using a pre-built binary for your
+Linux distribution, see instead <<Install From a Package Manager>>.
+
+=== OS Requirements
+
+Verilator is developed and has primary testing on Ubuntu.  Versions have
+also built on Redhat Linux, Apple OS-X, HPUX and Solaris.  It should run
+with minor porting on any GNU/Linux-ish platform.  Verilator also works on
+Windows under Cygwin, and Windows under MinGW (gcc -mno-cygwin).  Verilated
+output (not Verilator itself) compiles under all the options above, plus
+MSVC++.
+
+=== Install Prerequisites
+
+To build or run Verilator you need these standard packages:
+
+   sudo apt-get install perl python3
+   sudo apt-get install make
+   sudo apt-get install g++  # Alternatively, clang
+   sudo apt-get install libgz  # Non-Ubuntu (ignore if gives error)
+   sudo apt-get install libfl2 libfl-dev zlibc zlib1g zlib1g-dev  # Ubuntu only (ignore if gives error)
+
+To build or run the following are optional but should be installed for
+good performance:
+
+   sudo apt-get install ccache  # If present at build, needed for run
+   sudo apt-get install libgoogle-perftools-dev numactl
+
+To build Verilator you will need to install these packages; these do not
+need to be present to run Verilator:
+
+   sudo apt-get install git
+   sudo apt-get install autoconf flex bison
+
+Those developing Verilator itself may also want these (see internals.adoc):
+
+   sudo apt-get install gdb asciidoctor graphviz cmake clang-format
+   cpan install Pod::Perldoc
+   cpan install Unix::Processors
+   cpan install Parallel::Forker
+   cpan install Bit::Vector
+
+==== Install SystemC
+
+If you will be using SystemC (vs straight C++ output), download
+https://www.accellera.org/downloads/standards/systemc[SystemC].
+Follow their installation instructions.  You will need to set `SYSTEMC_INCLUDE`
+to point to the include directory with `systemc.h` in it, and `SYSTEMC_LIBDIR`
+to points to the directory with `libsystemc.a` in it.  (Older installations
+may set `SYSTEMC` and `SYSTEMC_ARCH` instead.)
+
+==== Install GTKWave
+
+To make use of Verilator FST tracing you will want
+http://gtkwave.sourceforge.net/[GTKwave] installed, however this is not
+required at Verilator build time.
+
+=== Obtain Sources
+
+You may use Git or a tarball for the sources.  Git is the supported option.
+(If using a historical build that uses a tarball, tarballs are obtained
+from https://www.veripool.org/projects/verilator/wiki/Download[Verilator
+Downloads]; we presume you know how to use it, and is not described here.)
+
+Get the sources from the repository: (You need do this only once, ever.)
+
+   git clone https://git.veripool.org/git/verilator   # Only first time
+   ## Note the URL above is not a page you can see with a browser, it's for git only
+
+Enter the checkout and determine what version/branch to use:
+
+   cd verilator
+   git pull        # Make sure we're up-to-date
+   git tag         # See what versions exist
+   #git checkout master      # Use development branch (e.g. recent bug fix)
+   #git checkout stable      # Use most recent release
+   #git checkout v{version}  # Switch to specified release version
+
+=== Auto Configure
+
+Create the configuration script:
+
+   autoconf        # Create ./configure script
+
+=== Eventual Installation Options
+
+Before configuring the build, you have to decide how you're going to
+eventually install the kit.  Verilator will be compiling the current value
+of `VERILATOR_ROOT`, `SYSTEMC_INCLUDE`, and `SYSTEMC_LIBDIR` as defaults
+into the executable, so they must be correct before configuring.
+
+These are the options:
+
+==== 1. Run-in-Place from VERILATOR_ROOT
+
+Our personal favorite is to always run Verilator in-place from its Git
+directory.  This allows the easiest experimentation and upgrading, and
+allows many versions of Verilator to co-exist on a system.
+
+   export VERILATOR_ROOT=`pwd`   # if your shell is bash
+   setenv VERILATOR_ROOT `pwd`   # if your shell is csh
+   ./configure
+   # Running will use files from $VERILATOR_ROOT, so no install needed
+
+Note after installing (below steps), a calling program or shell must set
+the environment variable `VERILATOR_ROOT` to point to this Git directory,
+then execute `$VERILATOR_ROOT/bin/verilator`, which will find the path to
+all needed files.
+
+==== 2. Install into a CAD Disk
+
+You may eventually be installing onto a project/company-wide "CAD" tools
+disk that may support multiple versions of every tool.  Target the build to
+a destination directory name that includes the Verilator version name:
+
+   unset VERILATOR_ROOT      # if your shell is bash
+   unsetenv VERILATOR_ROOT   # if your shell is csh
+   # For the tarball, use the version number instead of git describe
+   ./configure --prefix /CAD_DISK/verilator/`git describe | sed "s/verilator_//"`
+
+Note after installing (below steps), if you use
+http://modules.sourceforge.net/[modulecmd], you'll want a module file like
+the following:
+
+.modulecmd's verilator/version file
+----
+set install_root /CAD_DISK/verilator/{version-number-used-above}
+unsetenv VERILATOR_ROOT
+prepend-path PATH $install_root/bin
+prepend-path MANPATH $install_root/man
+prepend-path PKG_CONFIG_PATH $install_root/share/pkgconfig
+----
+
+==== 3. Install into a Specific Path
+
+You may eventually install Verilator into a specific installation prefix,
+as most GNU tools support:
+
+   unset VERILATOR_ROOT      # if your shell is bash
+   unsetenv VERILATOR_ROOT   # if your shell is csh
+   ./configure --prefix /opt/verilator-VERSION
+
+Then after installing (below steps) you will need to add
+`/opt/verilator-VERSION/bin` to `$PATH`.
+
+==== 4. Install System Globally
+
+The final option is to eventually install Verilator globally, using the
+normal system paths:
+
+   unset VERILATOR_ROOT      # if your shell is bash
+   unsetenv VERILATOR_ROOT   # if your shell is csh
+   ./configure
+
+Then after installing (below) the binary directories should already be in
+your `$PATH`.
+
+=== Configure
+
+The command to configure the package was described in the previous step.
+Developers should configure to have more complete developer tests.
+Additional packages may be required for these tests.
+
+   export VERILATOR_AUTHOR_SITE=1    # Put in your .bashrc
+   ./configure --enable-longtests  ...above options...
+
+=== Compile
+
+Compile Verilator:
+
+   make -j
+
+=== Test
+
+Check the compilation by running self-tests:
+
+   make test
+
+=== Install
+
+If you used any but the <<1. Run-in-Place from VERILATOR_ROOT>> scheme,
+install to the OS-standard place:
+
+   make install
+
+== Running Verilator
+
+To run Verilator, see the example sections in the
+https://verilator.org/verilator_doc.html[Verilator manual (HTML)],
+or https://verilator.org/verilator_doc.pdf[Verilator manual (PDF)].
+
+Also see the `examples/` directory that is part of the kit, and is installed
+(in a OS-specific place, often in e.g. `/usr/local/share/verilator/examples`).
+
+     cd examples/make_hello_c
+     make
+
+Note if you did a `make install` above you should not have `VERILATOR_ROOT`
+set in your environment; it is built into the executable.
+
+== Announcements
+
+To get notified of new releases, login to
+https://www.veripool.org[Veripool], and click the "watch" button near the
+top right under https://www.veripool.org/projects/verilator/news[Verilator
+News].
+
+== Directory Structure
+
+Some relevant files and directories in this package are as follows:
+
+   Changes                     => Version history
+   README.adoc                 => This document
+   bin/verilator               => Compiler wrapper invoked to Verilate code
+   docs/                       => Additional documentation
+   examples/make_hello_c       => Example GNU-make simple Verilog->C++ conversion
+   examples/make_hello_sc      => Example GNU-make simple Verilog->SystemC conversion
+   examples/make_tracing_c     => Example GNU-make Verilog->C++ with tracing
+   examples/make_tracing_sc    => Example GNU-make Verilog->SystemC with tracing
+   examples/make_protect_lib   => Example using --protect-lib
+   examples/cmake_hello_c      => Example building make_hello_c with CMake
+   examples/cmake_hello_sc     => Example building make_hello_sc with CMake
+   examples/cmake_tracing_c    => Example building make_tracing_c with CMake
+   examples/cmake_tracing_sc   => Example building make_tracing_sc with CMake
+   examples/cmake_protect_lib  => Example building make_protect_lib with CMake
+   include/                    => Files that should be in your -I compiler path
+   include/verilated*.cpp      => Global routines to link into your simulator
+   include/verilated*.h        => Global headers
+   include/verilated.mk        => Common Makefile
+   src/                        => Translator source code
+   test_regress                => Internal tests
+
+For files created after a design is Verilated, see the
+https://verilator.org/verilator_doc.html[Verilator manual (HTML)],
+or https://verilator.org/verilator_doc.pdf[Verilator manual (PDF)].
+
+== License
+
+Copyright 2008-2020 by Wilson Snyder.  Verilator is free software; you can
+redistribute it and/or modify it under the terms of either the GNU Lesser
+General Public License Version 3 or the Perl Artistic License Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0

docs/xml.adoc

@@ -0,0 +1,72 @@
+= Verilator XML Output
+:toc: right
+
+// Github doesn't render unless absolute URL
+image::https://www.veripool.org/img/verilator_256_200_min.png[Logo,256,200,role="right"]
+
+== Introduction
+
+This document describes Verilator's XML output. For more general information
+please see https://verilator.org[verilator.org].
+
+== General
+
+Verilator's XML output is enabled with the `--xml-only` flag. It contains
+limited information about the elaborated design including files, modules,
+instance hierarchy, logic and data types. There is no formal schema since part
+of the structure of the XML document matches the compiled code which would
+require the schema to describe legal SystemVerilog structure. The intended
+usage is to enable other downstream tools to take advantage of Verilator's
+parser.
+
+== Structure
+
+The XML document consists of 4 sections within the top level `verilator_xml`
+element:
+
+`<files>`...`</files>`::
+
+This section contains a list of all design files read, including the
+built-in constructs and the command line as their own entries.  Each
+`<file>` has an attribute `id` which is a short ASCII string unique to that
+file. Other elements' `loc` attributes use this id to refer to a particular
+file.
+
+`<module_files>`...`</module_files>`::
+
+All files containing Verilog module definitions are listed in this section.
+This element's contents is a subset of the `<files>` element's contents.
+
+`<cells>`...`</cells>`::
+
+The cells section of the XML document contains the design instance
+hierarchy.  Each instance is represented with the `<cell>` element with the
+following attributes:
+
+* `fl` (deprecated): The file id and line number where the module was
+  instanced.  Use `loc` instead.
+
+* `loc`: The file id, first line number, last line number, first column
+   number and last column number of the identifier where the module was
+   instanced, separated by commas.
+
+* `name`: The instance name.
+
+* `submodname`: The module name uniquified with particular parameter values (if any).
+
+* `hier`: The full hierarchy path.
+
+`<netlist>`...`</netlist>`::
+
+The netlist section contains a number of `<module>`...`</module>` elements,
+each describing the contents of that module, and a single `<typetable>`...
+`</typetable>` element which lists all used types used within the
+modules. Each type has a numeric `id` attribute that is referred to by
+elements in the `<module>` elements using the `dtype_id` attribute.
+
+== Distribution
+
+Copyright 2020-2020 by Wilson Snyder.  Verilator is free software; you can
+redistribute it and/or modify it under the terms of either the GNU Lesser
+General Public License Version 3 or the Perl Artistic License Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0

examples/cmake_hello_c/.gitignore

@@ -0,0 +1 @@
+build*

examples/cmake_hello_c/CMakeLists.txt

@@ -0,0 +1,38 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake Example: Small CMakeLists.txt
+#
+# This is an example cmake script to build a verilog to systemc project
+# using cmake and verilator.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+# This example builds the tracing_c example using CMake
+# To use it, run the following:
+
+# cd /path/to/verilator/examples/cmake_c
+# rm -rf build && mkdir build && cd build
+# cmake ..
+# cmake --build .
+
+cmake_minimum_required(VERSION 3.8)
+project(cmake_hello_c)
+
+find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
+if (NOT verilator_FOUND)
+  message(FATAL_ERROR "Verilator was not found. Either install it, or set the VERILATOR_ROOT environment variable")
+endif()
+
+# Create a new executable target that will contain all your sources
+add_executable(example ../make_hello_c/sim_main.cpp)
+
+# Add the Verilated circuit to the target
+verilate(example
+  INCLUDE_DIRS "../make_hello_c"
+  SOURCES ../make_hello_c/top.v)

examples/cmake_hello_c/Makefile

@@ -0,0 +1,80 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake example usage
+#
+# This file shows usage of the CMake script.
+# This makefile is here for testing the examples and should
+# generally not be added to a CMake project.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+######################################################################
+# Set up variables
+
+# If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
+# package install, and verilator is in your path. Otherwise find the
+# binary relative to $VERILATOR_ROOT (such as when inside the git sources).
+
+ifeq ($(VERILATOR_ROOT),)
+VERILATOR_COVERAGE = verilator_coverage
+else
+export VERILATOR_ROOT
+VERILATOR_COVERAGE = $(VERILATOR_ROOT)/bin/verilator_coverage
+endif
+######################################################################
+
+# Check if CMake is installed and of correct version
+ifeq ($(shell which cmake),)
+TARGET := nocmake
+else
+CMAKE_VERSION := $(shell cmake --version | grep -Po '(\d[\.\d]+)')
+CMAKE_MAJOR := $(shell echo $(CMAKE_VERSION) | cut -f1 -d.)
+CMAKE_MINOR := $(shell echo $(CMAKE_VERSION) | cut -f2 -d.)
+CMAKE_GT_3_8 := $(shell [ $(CMAKE_MAJOR) -gt 3 -o \( $(CMAKE_MAJOR) -eq 3 -a $(CMAKE_MINOR) -ge 8 \) ] && echo true)
+ifeq ($(CMAKE_GT_3_8),true)
+TARGET := run
+else
+TARGET := oldcmake
+endif
+endif
+
+default: $(TARGET)
+
+run:
+	@echo
+	@echo "-- Verilator CMake hello world example"
+
+	@echo
+	@echo "-- VERILATE ----------------"
+	mkdir -p build && cd build && cmake ..
+
+	@echo
+	@echo "-- BUILD -------------------"
+	cmake --build build
+
+	@echo
+	@echo "-- RUN ---------------------"
+	build/example
+
+	@echo
+	@echo "-- DONE --------------------"
+	@echo
+
+clean mostlyclean distclean maintainer-clean:
+	@rm -rf build logs
+
+nocmake:
+	@echo
+	@echo "%Skip: CMake has not been found"
+	@echo
+
+oldcmake:
+	@echo
+	@echo "%Skip: CMake version is too old (need at least 3.8)"
+	@echo

examples/cmake_hello_sc/.gitignore

@@ -0,0 +1 @@
+build*

examples/cmake_hello_sc/CMakeLists.txt

@@ -0,0 +1,47 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake Example: Small CMakeLists.txt with SystemC
+#
+# This is an example cmake script to build a verilog to SystemC project
+# using CMake and Verilator.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+# This example builds the tracing_sc example using CMake
+# To use it, run the following:
+
+# cd /path/to/verilator/examples/cmake_sc
+# rm -rf build && mkdir build && cd build
+# cmake ..
+# cmake --build .
+
+cmake_minimum_required(VERSION 3.8)
+project(cmake_hello_sc)
+
+find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
+if (NOT verilator_FOUND)
+  message(FATAL_ERROR "Verilator was not found. Either install it, or set the VERILATOR_ROOT environment variable")
+endif()
+
+# SystemC dependencies
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+find_package(Threads REQUIRED)
+
+# Find SystemC using SystemC's CMake integration
+find_package(SystemCLanguage QUIET)
+
+# Create a new executable target that will contain all your sources
+add_executable(example ../make_hello_sc/sc_main.cpp)
+
+# Add the Verilated circuit to the target
+verilate(example SYSTEMC
+  INCLUDE_DIRS "../make_hello_sc"
+  SOURCES ../make_hello_sc/top.v)
+
+verilator_link_systemc(example)

examples/cmake_hello_sc/Makefile

@@ -0,0 +1,130 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake example usage
+#
+# This file shows usage of the CMake script.
+# This makefile is here for testing the examples and should
+# generally not be added to a CMake project.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+######################################################################
+# Set up variables
+
+# If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
+# package install, and verilator is in your path. Otherwise find the
+# binary relative to $VERILATOR_ROOT (such as when inside the git sources).
+
+ifeq ($(VERILATOR_ROOT),)
+VERILATOR_COVERAGE = verilator_coverage
+else
+export VERILATOR_ROOT
+VERILATOR_COVERAGE = $(VERILATOR_ROOT)/bin/verilator_coverage
+endif
+######################################################################
+
+# Check if CMake is installed and of correct version
+ifeq ($(shell which cmake),)
+	TARGET := nocmake
+else
+CMAKE_VERSION := $(shell cmake --version | grep -Po '(\d[\.\d]+)')
+CMAKE_MAJOR := $(shell echo $(CMAKE_VERSION) | cut -f1 -d.)
+CMAKE_MINOR := $(shell echo $(CMAKE_VERSION) | cut -f2 -d.)
+CMAKE_GT_3_8 := $(shell [ $(CMAKE_MAJOR) -gt 3 -o \( $(CMAKE_MAJOR) -eq 3 -a $(CMAKE_MINOR) -ge 8 \) ] && echo true)
+ifneq ($(CMAKE_GT_3_8),true)
+TARGET := oldcmake
+else
+
+# Test existence of SYSTEMC_INCLUDE and SYSTEMC_LIBDIR environment variabless
+ifneq (,$(SYSTEMC_INCLUDE))
+ifneq (,${SYSTEMC_LIBDIR})
+SYSTEMC_SET := true
+endif
+endif
+
+# Test existence of SYSTEMC_ROOT environment variable
+ifneq (SYSTEMC_SET, true)
+ifneq (,${SYSTEMC_ROOT})
+SYSTEMC_SET := true
+endif
+endif
+
+# Test existence of SYSTEMC environment variable
+ifneq (SYSTEMC_SET, true)
+ifneq (,${SYSTEMC})
+SYSTEMC_SET := true
+endif
+endif
+
+# Test whether SystemC is installed with CMake support
+# This will print a CMake error about processing arguments that can (currently) be ignored.
+ifneq (SYSTEMC_SET, true)
+FINDSC := $(shell mkdir -p build && cd build && cmake --find-package -DNAME=SystemCLanguage -DCMAKE_USE_PTHREADS_INIT=ON -DCOMPILER_ID=GNU -DLANGUAGE=CXX -DMODE=EXIST -DThreads_FOUND=ON)
+ifneq (,$(findstring SystemCLanguage found,$(FINDSC)))
+SYSTEMC_SET := true
+endif
+endif
+
+ifeq ($(SYSTEMC_SET), true)
+TARGET := run
+else
+TARGET := nosc
+endif
+
+endif
+endif
+
+default: $(TARGET)
+
+run:
+	@echo
+	@echo "-- Verilator CMake SystemC hello-world simple example"
+
+	@echo
+	@echo "-- VERILATE ----------------"
+	mkdir -p build && cd build && cmake ..
+
+	@echo
+	@echo "-- BUILD -------------------"
+	cmake --build build
+
+	@echo
+	@echo "-- RUN ---------------------"
+	@mkdir -p logs
+	build/example
+
+	@echo "-- DONE --------------------"
+	@echo "Note: Once this example is understood, see examples/cmake_tracing_sc."
+	@echo "Note: Also see the EXAMPLE section in the verilator manpage/document."
+
+clean mostlyclean distclean maintainer-clean:
+	@rm -rf build logs
+
+nocmake:
+	@echo
+	@echo "%Skip: CMake has not been found"
+	@echo
+
+oldcmake:
+	@echo
+	@echo "%Skip: CMake version is too old (need at least 3.8)"
+	@echo
+
+nosc:
+	@echo
+	@echo "%Skip: CMake could not find SystemC."
+	@echo "% Make sure that either:"
+	@echo "% - The environment variables SYSTEMC_INCLUDE and SYSTEMC_LIBDIR are exported."
+	@echo "% - Or, the environment variable SYSTEMC_ROOT is exported."
+	@echo "% - Or, The environment variable SYSTEMC is exported."
+	@echo "% - Or, if the SystemC installation provides CMake support,"
+	@echo "%   that its installation prefix is in CMAKE_PREFIX_PATH."
+	@echo "% Also that the C++ standard of the SystemC library is the same as this example."
+	@echo "% Please see the Verilator documentation's CMake section for more information."
+	@echo

examples/cmake_protect_lib/.gitignore

@@ -0,0 +1 @@
+build*

examples/cmake_protect_lib/CMakeLists.txt

@@ -0,0 +1,61 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake Example: Small CMakeLists.txt
+#
+# This is an example cmake script to build a verilog to systemc project
+# using cmake and verilator.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+# This example builds the tracing_c example using CMake
+# To use it, run the following:
+
+# cd /path/to/verilator/examples/cmake_c
+# rm -rf build && mkdir build && cd build
+# cmake ..
+# cmake --build .
+
+cmake_minimum_required(VERSION 3.8)
+project(cmake_protect_lib)
+
+find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
+if (NOT verilator_FOUND)
+  message(FATAL_ERROR "Verilator was not found. Either install it, or set the VERILATOR_ROOT environment variable")
+endif()
+
+# Create the main executable target
+add_executable(example ../make_protect_lib/sim_main.cpp)
+
+# Create a secret library
+add_library(verilated_secret STATIC) # or SHARED for a shared library
+target_link_libraries(example PRIVATE verilated_secret)
+# To create both libraries on CMake >= 3.12 replace the above 2 lines with the following:
+# add_library(verilated_secret OBJECT)
+# set_property(TARGET verilated_secret PROPERTY POSITION_INDEPENDENT_CODE 1)
+# add_library(verilated_secret_static STATIC  $<TARGET_OBJECTS:verilated_secret>)
+# set_target_properties(verilated_secret_static PROPERTIES OUTPUT_NAME verilated_secret)
+# add_library(verilated_secret_shared SHARED  $<TARGET_OBJECTS:verilated_secret>)
+# set_target_properties(verilated_secret_shared PROPERTIES OUTPUT_NAME verilated_secret)
+# target_link_libraries(example PRIVATE verilated_secret_static)
+
+# Setup random seed
+verilator_generate_key(KEY_INIT)
+set(PROTECT_KEY ${KEY_INIT} CACHE STRING "Random seed for protection")
+
+# Add the Verilated modules to the targets
+verilate(verilated_secret
+  VERILATOR_ARGS --protect-lib verilated_secret
+                 --protect-key ${PROTECT_KEY}
+  DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/verilated_secret
+  SOURCES ../make_protect_lib/secret_impl.v)
+
+# Include location of verilated_secret.sv wrapper
+verilate(example
+  VERILATOR_ARGS "-I${CMAKE_CURRENT_BINARY_DIR}/verilated_secret"
+  SOURCES ../make_protect_lib/top.v)

examples/cmake_protect_lib/Makefile

@@ -0,0 +1,80 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake example usage
+#
+# This file shows usage of the CMake script.
+# This makefile is here for testing the examples and should
+# generally not be added to a CMake project.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+######################################################################
+# Set up variables
+
+# If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
+# package install, and verilator is in your path. Otherwise find the
+# binary relative to $VERILATOR_ROOT (such as when inside the git sources).
+
+ifeq ($(VERILATOR_ROOT),)
+VERILATOR_COVERAGE = verilator_coverage
+else
+export VERILATOR_ROOT
+VERILATOR_COVERAGE = $(VERILATOR_ROOT)/bin/verilator_coverage
+endif
+######################################################################
+
+# Check if CMake is installed and of correct version
+ifeq ($(shell which cmake),)
+TARGET := nocmake
+else
+CMAKE_VERSION := $(shell cmake --version | grep -Po '(\d[\.\d]+)')
+CMAKE_MAJOR := $(shell echo $(CMAKE_VERSION) | cut -f1 -d.)
+CMAKE_MINOR := $(shell echo $(CMAKE_VERSION) | cut -f2 -d.)
+CMAKE_GT_3_8 := $(shell [ $(CMAKE_MAJOR) -gt 3 -o \( $(CMAKE_MAJOR) -eq 3 -a $(CMAKE_MINOR) -ge 8 \) ] && echo true)
+ifeq ($(CMAKE_GT_3_8),true)
+TARGET := run
+else
+TARGET := oldcmake
+endif
+endif
+
+default: $(TARGET)
+
+run:
+	@echo
+	@echo "-- Verilator CMake protect_lib example"
+
+	@echo
+	@echo "-- VERILATE ----------------"
+	mkdir -p build && cd build && cmake ..
+
+	@echo
+	@echo "-- BUILD -------------------"
+	cmake --build build
+
+	@echo
+	@echo "-- RUN ---------------------"
+	build/example
+
+	@echo
+	@echo "-- DONE --------------------"
+	@echo
+
+clean mostlyclean distclean maintainer-clean:
+	@rm -rf build logs
+
+nocmake:
+	@echo
+	@echo "%Skip: CMake has not been found"
+	@echo
+
+oldcmake:
+	@echo
+	@echo "%Skip: CMake version is too old (need at least 3.8)"
+	@echo

examples/cmake_tracing_c/.gitignore

@@ -0,0 +1,2 @@
+build*
+logs

examples/cmake_tracing_c/CMakeLists.txt

@@ -0,0 +1,39 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake Example: Small CMakeLists.txt with tracing
+#
+# This is an example cmake script to build a verilog to systemc project
+# using cmake and verilator.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+# This example builds the make_tracing_c example using CMake
+# To use it, run the following:
+
+# cd /path/to/verilator/examples/cmake_tracing_c
+# rm -rf build && mkdir build && cd build
+# cmake ..
+# cmake --build .
+
+cmake_minimum_required(VERSION 3.8)
+project(cmake_tracing_c)
+
+find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
+if (NOT verilator_FOUND)
+  message(FATAL_ERROR "Verilator was not found. Either install it, or set the VERILATOR_ROOT environment variable")
+endif()
+
+# Create a new executable target that will contain all your sources
+add_executable(example ../make_tracing_c/sim_main.cpp)
+
+# Add the Verilated circuit to the target
+verilate(example COVERAGE TRACE
+  INCLUDE_DIRS "../make_tracing_c"
+  VERILATOR_ARGS -f ../make_tracing_c/input.vc -Os -x-assign 0
+  SOURCES ../make_tracing_c/top.v)

examples/cmake_tracing_c/Makefile

@@ -0,0 +1,86 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake example usage
+#
+# This file shows usage of the CMake script.
+# This makefile is here for testing the examples and should
+# generally not be added to a CMake project.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+######################################################################
+# Set up variables
+
+# If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
+# package install, and verilator is in your path. Otherwise find the
+# binary relative to $VERILATOR_ROOT (such as when inside the git sources).
+
+ifeq ($(VERILATOR_ROOT),)
+VERILATOR_COVERAGE = verilator_coverage
+else
+export VERILATOR_ROOT
+VERILATOR_COVERAGE = $(VERILATOR_ROOT)/bin/verilator_coverage
+endif
+######################################################################
+
+# Check if CMake is installed and of correct version
+ifeq ($(shell which cmake),)
+TARGET := nocmake
+else
+CMAKE_VERSION := $(shell cmake --version | grep -Po '(\d[\.\d]+)')
+CMAKE_MAJOR := $(shell echo $(CMAKE_VERSION) | cut -f1 -d.)
+CMAKE_MINOR := $(shell echo $(CMAKE_VERSION) | cut -f2 -d.)
+CMAKE_GT_3_8 := $(shell [ $(CMAKE_MAJOR) -gt 3 -o \( $(CMAKE_MAJOR) -eq 3 -a $(CMAKE_MINOR) -ge 8 \) ] && echo true)
+ifeq ($(CMAKE_GT_3_8),true)
+TARGET := run
+else
+TARGET := oldcmake
+endif
+endif
+
+default: $(TARGET)
+
+run:
+	@echo
+	@echo "-- Verilator CMake tracing example"
+
+	@echo
+	@echo "-- VERILATE ----------------"
+	mkdir -p build && cd build && cmake ..
+
+	@echo
+	@echo "-- BUILD -------------------"
+	cmake --build build
+
+	@echo
+	@echo "-- RUN ---------------------"
+	@mkdir -p logs
+	build/example +trace
+
+	@echo
+	@echo "-- COVERAGE ----------------"
+	$(VERILATOR_COVERAGE) --annotate logs/annotated logs/coverage.dat
+
+	@echo
+	@echo "-- DONE --------------------"
+	@echo "To see waveforms, open vlt_dump.vcd in a waveform viewer"
+	@echo
+
+clean mostlyclean distclean maintainer-clean:
+	@rm -rf build logs
+
+nocmake:
+	@echo
+	@echo "%Skip: CMake has not been found"
+	@echo
+
+oldcmake:
+	@echo
+	@echo "%Skip: CMake version is too old (need at least 3.8)"
+	@echo

examples/cmake_tracing_sc/.gitignore

@@ -0,0 +1,7 @@
+*.dmp
+*.log
+*.csrc
+*.vcd
+obj_*
+logs
+build*

examples/cmake_tracing_sc/CMakeLists.txt

@@ -0,0 +1,48 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake Example: Small CMakeLists.txt with SystemC tracing
+#
+# This is an example cmake script to build a verilog to SystemC project
+# using CMake and Verilator.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+# This example builds the tracing_sc example using CMake
+# To use it, run the following:
+
+# cd /path/to/verilator/examples/cmake_tracing_sc
+# rm -rf build && mkdir build && cd build
+# cmake ..
+# cmake --build .
+
+cmake_minimum_required(VERSION 3.8)
+project(cmake_tracing_sc_example)
+
+find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
+if (NOT verilator_FOUND)
+  message(FATAL_ERROR "Verilator was not found. Either install it, or set the VERILATOR_ROOT environment variable")
+endif()
+
+# SystemC dependencies
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+find_package(Threads REQUIRED)
+
+# Find SystemC using SystemC's CMake integration
+find_package(SystemCLanguage QUIET)
+
+# Create a new executable target that will contain all your sources
+add_executable(example ../make_tracing_sc/sc_main.cpp)
+
+# Add the Verilated circuit to the target
+verilate(example SYSTEMC COVERAGE TRACE
+  INCLUDE_DIRS "../make_tracing_sc"
+  VERILATOR_ARGS -f ../make_tracing_sc/input.vc -Os -x-assign 0
+  SOURCES ../make_tracing_sc/top.v)
+
+verilator_link_systemc(example)

examples/cmake_tracing_sc/Makefile

@@ -0,0 +1,135 @@
+######################################################################
+#
+# DESCRIPTION: Verilator CMake example usage
+#
+# This file shows usage of the CMake script.
+# This makefile is here for testing the examples and should
+# generally not be added to a CMake project.
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+######################################################################
+# Set up variables
+
+# If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
+# package install, and verilator is in your path. Otherwise find the
+# binary relative to $VERILATOR_ROOT (such as when inside the git sources).
+
+ifeq ($(VERILATOR_ROOT),)
+VERILATOR_COVERAGE = verilator_coverage
+else
+export VERILATOR_ROOT
+VERILATOR_COVERAGE = $(VERILATOR_ROOT)/bin/verilator_coverage
+endif
+######################################################################
+
+# Check if CMake is installed and of correct version
+ifeq ($(shell which cmake),)
+	TARGET := nocmake
+else
+CMAKE_VERSION := $(shell cmake --version | grep -Po '(\d[\.\d]+)')
+CMAKE_MAJOR := $(shell echo $(CMAKE_VERSION) | cut -f1 -d.)
+CMAKE_MINOR := $(shell echo $(CMAKE_VERSION) | cut -f2 -d.)
+CMAKE_GT_3_8 := $(shell [ $(CMAKE_MAJOR) -gt 3 -o \( $(CMAKE_MAJOR) -eq 3 -a $(CMAKE_MINOR) -ge 8 \) ] && echo true)
+ifneq ($(CMAKE_GT_3_8),true)
+TARGET := oldcmake
+else
+
+# Test existence of SYSTEMC_INCLUDE and SYSTEMC_LIBDIR environment variabless
+ifneq (,$(SYSTEMC_INCLUDE))
+ifneq (,${SYSTEMC_LIBDIR})
+SYSTEMC_SET := true
+endif
+endif
+
+# Test existence of SYSTEMC_ROOT environment variable
+ifneq (SYSTEMC_SET, true)
+ifneq (,${SYSTEMC_ROOT})
+SYSTEMC_SET := true
+endif
+endif
+
+# Test existence of SYSTEMC environment variable
+ifneq (SYSTEMC_SET, true)
+ifneq (,${SYSTEMC})
+SYSTEMC_SET := true
+endif
+endif
+
+# Test whether SystemC is installed with CMake support
+# This will print a CMake error about processing arguments that can (currently) be ignored.
+ifneq (SYSTEMC_SET, true)
+FINDSC := $(shell mkdir -p build && cd build && cmake --find-package -DNAME=SystemCLanguage -DCMAKE_USE_PTHREADS_INIT=ON -DCOMPILER_ID=GNU -DLANGUAGE=CXX -DMODE=EXIST -DThreads_FOUND=ON)
+ifneq (,$(findstring SystemCLanguage found,$(FINDSC)))
+SYSTEMC_SET := true
+endif
+endif
+
+ifeq ($(SYSTEMC_SET), true)
+TARGET := run
+else
+TARGET := nosc
+endif
+
+endif
+endif
+
+default: $(TARGET)
+
+run:
+	@echo
+	@echo "-- Verilator CMake SystemC tracing example"
+
+	@echo
+	@echo "-- VERILATE ----------------"
+	mkdir -p build && cd build && cmake ..
+
+	@echo
+	@echo "-- BUILD -------------------"
+	cmake --build build
+
+	@echo
+	@echo "-- RUN ---------------------"
+	@mkdir -p logs
+	build/example +trace
+
+	@echo
+	@echo "-- COVERAGE ----------------"
+	$(VERILATOR_COVERAGE) --annotate logs/annotated logs/coverage.dat
+
+	@echo
+	@echo "-- DONE --------------------"
+	@echo "To see waveforms, open vlt_dump.vcd in a waveform viewer"
+	@echo
+
+clean mostlyclean distclean maintainer-clean:
+	@rm -rf build logs
+
+nocmake:
+	@echo
+	@echo "%Skip: CMake has not been found"
+	@echo
+
+oldcmake:
+	@echo
+	@echo "%Skip: CMake version is too old (need at least 3.8)"
+	@echo
+
+nosc:
+	@echo
+	@echo "%Skip: CMake could not find SystemC."
+	@echo "% Make sure that either:"
+	@echo "% - The environment variables SYSTEMC_INCLUDE and SYSTEMC_LIBDIR are exported."
+	@echo "% - Or, the environment variable SYSTEMC_ROOT is exported."
+	@echo "% - Or, The environment variable SYSTEMC is exported."
+	@echo "% - Or, if the SystemC installation provides CMake support,"
+	@echo "%   that its installation prefix is in CMAKE_PREFIX_PATH."
+	@echo "% Also that the C++ standard of the SystemC library is the same as this example."
+	@echo "% Please see the Verilator documentation's CMake section for more information."
+	@echo

examples/make_hello_c/Makefile

@@ -5,10 +5,11 @@
 # This calls the object directory makefile.  That allows the objects to
 # be placed in the "current directory" which simplifies the Makefile.
 #
-# Copyright 2003-2018 by Wilson Snyder. This program is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 #
 ######################################################################
 # Check for sanity to avoid later confusion
@@ -21,10 +22,10 @@ endif
 
 # This is intended to be a minimal example.  Before copying this to start a
 # real project, it is better to start with a more complete example,
-# e.g. examples/tracing_c.
+# e.g. examples/make_tracing_c.
 
 # If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
-# package inatall, and verilator is in your path. Otherwise find the
+# package install, and verilator is in your path. Otherwise find the
 # binary relative to $VERILATOR_ROOT (such as when inside the git sources).
 ifeq ($(VERILATOR_ROOT),)
 VERILATOR = verilator
@@ -35,14 +36,12 @@ endif
 
 default:
 	@echo "-- Verilator hello-world simple example"
-	@echo "-- VERILATE ----------------"
-	$(VERILATOR) -cc --exe top.v sim_main.cpp
-	@echo "-- COMPILE -----------------"
-	$(MAKE) -j 4 -C obj_dir -f Vtop.mk
+	@echo "-- VERILATE & BUILD --------"
+	$(VERILATOR) -cc --exe --build -j top.v sim_main.cpp
 	@echo "-- RUN ---------------------"
 	obj_dir/Vtop
 	@echo "-- DONE --------------------"
-	@echo "Note: Once this example is understood, see examples/tracing_c."
+	@echo "Note: Once this example is understood, see examples/make_tracing_c."
 	@echo "Note: Also see the EXAMPLE section in the verilator manpage/document."
 
 ######################################################################

examples/make_hello_c/sim_main.cpp

@@ -1,7 +1,8 @@
 // DESCRIPTION: Verilator: Verilog example module
 //
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2017 by Wilson Snyder.
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2017 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
 //======================================================================
 
 // Include common routines

examples/make_hello_c/top.v

@@ -1,7 +1,8 @@
 // DESCRIPTION: Verilator: Verilog example module
 //
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2017 by Wilson Snyder.
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2017 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
 
 // See also the EXAMPLE section in the verilator manpage/document.
 module top;

examples/make_hello_sc/Makefile

@@ -5,10 +5,11 @@
 # This calls the object directory makefile.  That allows the objects to
 # be placed in the "current directory" which simplifies the Makefile.
 #
-# Copyright 2003-2018 by Wilson Snyder. This program is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 #
 ######################################################################
 # Check for sanity to avoid later confusion
@@ -21,10 +22,10 @@ endif
 
 # This is intended to be a minimal example.  Before copying this to start a
 # real project, it is better to start with a more complete example,
-# e.g. examples/tracing_sc.
+# e.g. examples/make_tracing_sc.
 
 # If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
-# package inatall, and verilator is in your path. Otherwise find the
+# package install, and verilator is in your path. Otherwise find the
 # binary relative to $VERILATOR_ROOT (such as when inside the git sources).
 ifeq ($(VERILATOR_ROOT),)
 VERILATOR = verilator
@@ -44,14 +45,12 @@ endif
 
 run:
 	@echo "-- Verilator hello-world simple example"
-	@echo "-- VERILATE ----------------"
-	$(VERILATOR) -sc --exe top.v sc_main.cpp
-	@echo "-- COMPILE -----------------"
-	$(MAKE) -j 4 -C obj_dir -f Vtop.mk
+	@echo "-- VERILATE & COMPILE ------"
+	$(VERILATOR) -sc --exe --build -j top.v sc_main.cpp
 	@echo "-- RUN ---------------------"
 	obj_dir/Vtop
 	@echo "-- DONE --------------------"
-	@echo "Note: Once this example is understood, see examples/tracing_sc."
+	@echo "Note: Once this example is understood, see examples/make_tracing_sc."
 	@echo "Note: Also see the EXAMPLE section in the verilator manpage/document."
 
 ######################################################################

examples/make_hello_sc/sc_main.cpp

@@ -1,8 +1,9 @@
 // -*- SystemC -*-
 // DESCRIPTION: Verilator Example: Top level main for invoking SystemC model
 //
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2017 by Wilson Snyder.
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2017 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
 //======================================================================
 
 // SystemC global header
@@ -28,16 +29,16 @@ int sc_main(int argc, char* argv[]) {
     Vtop* top = new Vtop("top");
 
     // Initialize SC model
-#if (SYSTEMC_VERSION>=20070314)
-    sc_start(1,SC_NS);
+#if (SYSTEMC_VERSION >= 20070314)
+    sc_start(1, SC_NS);
 #else
     sc_start(1);
 #endif
 
     // Simulate until $finish
     while (!Verilated::gotFinish()) {
-#if (SYSTEMC_VERSION>=20070314)
-        sc_start(1,SC_NS);
+#if (SYSTEMC_VERSION >= 20070314)
+        sc_start(1, SC_NS);
 #else
         sc_start(1);
 #endif

examples/make_hello_sc/top.v

@@ -1,7 +1,8 @@
 // DESCRIPTION: Verilator: Verilog example module
 //
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2017 by Wilson Snyder.
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2017 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
 
 // See also the EXAMPLE section in the verilator manpage/document.
 module top;

examples/make_protect_lib/.gitignore

@@ -0,0 +1,2 @@
+obj_*
+logs

examples/make_protect_lib/Makefile

@@ -0,0 +1,98 @@
+######################################################################
+#
+# DESCRIPTION: Verilator Example: --protect-lib Makefile
+#
+# This calls the object directory makefiles.  That allows the objects to
+# be placed in the "current directory" which simplifies the Makefile.
+#
+# Copyright 2019 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+# Check for sanity to avoid later confusion
+
+ifneq ($(words $(CURDIR)),1)
+ $(error Unsupported: GNU Make cannot build in directories containing spaces, build elsewhere: '$(CURDIR)')
+endif
+
+######################################################################
+# Set up variables
+
+# If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
+# package install, and verilator is in your path. Otherwise find the
+# binary relative to $VERILATOR_ROOT (such as when inside the git sources).
+ifeq ($(VERILATOR_ROOT),)
+VERILATOR = verilator
+else
+export VERILATOR_ROOT
+VERILATOR = $(VERILATOR_ROOT)/bin/verilator
+endif
+
+VERILATOR_FLAGS =
+# Generate C++
+VERILATOR_FLAGS += -cc
+# Optimize
+VERILATOR_FLAGS += -Os -x-assign 0
+# Warn abount lint issues; may not want this on less solid designs
+VERILATOR_FLAGS += -Wall
+# Make waveforms
+TOP_VERILATOR_FLAGS = $(VERILATOR_FLAGS) --trace
+
+######################################################################
+default: run
+
+run:
+	@echo
+	@echo "-- Verilator --protect-lib example -_--------------------------"
+
+	@echo
+	@echo "-- VERILATE secret module -------------------------------------"
+	@echo " --protect-lib will produce both a static and shared library"
+	@echo " In this example the static library is used, but some"
+	@echo " simulators may require the shared library."
+	@echo "---------------------------------------------------------------"
+	$(VERILATOR) $(VERILATOR_FLAGS) --protect-lib verilated_secret -Mdir obj_dir_secret/ secret_impl.v
+
+	@echo
+	@echo "-- COMPILE protected library ----------------------------------"
+	@echo " This builds verilated_secret.sv, libverilated_secret.a and"
+	@echo " libverilated_secret.so which can be distributed apart from"
+	@echo " the source"
+	@echo "---------------------------------------------------------------"
+	$(MAKE) -j 4 -C obj_dir_secret -f Vsecret_impl.mk
+
+	@echo
+	@echo "-- VERILATE top module ----------------------------------------"
+	@echo " Use the SystemVerilog wrapper (verilated_secret.sv) and the"
+	@echo " library (libverilated_secret.a) generated from the previous"
+	@echo " step"
+	@echo "---------------------------------------------------------------"
+	$(VERILATOR) $(TOP_VERILATOR_FLAGS) --exe -LDFLAGS '-L../obj_dir_secret -lverilated_secret -static' top.v obj_dir_secret/verilated_secret.sv sim_main.cpp
+
+	@echo
+	@echo "-- COMPILE entire design --------------------------------------"
+	$(MAKE) -j 4 -C obj_dir -f Vtop.mk
+
+	@echo
+	@echo "-- RUN --------------------------------------------------------"
+	@mkdir -p logs
+	obj_dir/Vtop +trace
+
+	@echo
+	@echo "-- DONE -------------------------------------------------------"
+	@echo "To see waveforms, open logs/vlt_dump.vcd in a waveform viewer"
+	@echo
+
+
+######################################################################
+# Other targets
+
+show-config:
+	$(VERILATOR) -V
+
+maintainer-copy::
+clean mostlyclean distclean maintainer-clean::
+	-rm -rf obj_dir* logs *.log core

examples/make_protect_lib/secret_impl.v

@@ -0,0 +1,30 @@
+// DESCRIPTION: Verilator: --protect-lib example secret module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2019 by Todd Strader.
+// SPDX-License-Identifier: CC0-1.0
+
+// This module will be used as libsecret.a or libsecret.so without
+// exposing the source.
+
+module secret_impl
+  (
+   input [31:0]        a,
+   input [31:0]        b,
+   output logic [31:0] x,
+   input               clk);
+
+   logic [31:0]        accum_q = 0;
+   logic [31:0]        secret_value = 9;
+
+   initial $display("%m: initialized");
+
+   always @(posedge clk) begin
+      accum_q <= accum_q + a;
+      if (accum_q > 10)
+        x <= b;
+      else
+        x <= a + b + secret_value;
+   end
+
+endmodule

examples/make_protect_lib/sim_main.cpp

@@ -0,0 +1,75 @@
+// DESCRIPTION: Verilator: --protect-lib example module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2019 by Todd Strader.
+// SPDX-License-Identifier: CC0-1.0
+//======================================================================
+
+// See examples/tracing_c for notes on tracing
+
+// Include common routines
+#include <verilated.h>
+
+#include "Vtop.h"
+
+#if VM_TRACE
+# include <verilated_vcd_c.h>
+#endif
+
+vluint64_t main_time = 0;
+double sc_time_stamp() { return main_time; }
+
+int main(int argc, char** argv, char** env) {
+    if (0 && argc && argv && env) {}
+
+    Verilated::debug(0);
+    Verilated::randReset(2);
+    Verilated::commandArgs(argc, argv);
+
+    // Construct the Verilated model, including the secret module
+    Vtop* top = new Vtop;
+
+#if VM_TRACE
+    // When tracing, the contents of the secret module will not be seen
+    VerilatedVcdC* tfp = NULL;
+    const char* flag = Verilated::commandArgsPlusMatch("trace");
+    if (flag && 0 == strcmp(flag, "+trace")) {
+        Verilated::traceEverOn(true);
+        VL_PRINTF("Enabling waves into logs/vlt_dump.vcd...\n");
+        tfp = new VerilatedVcdC;
+        top->trace(tfp, 99);
+        Verilated::mkdir("logs");
+        tfp->open("logs/vlt_dump.vcd");
+    }
+#endif
+
+    top->clk = 0;
+
+    // Simulate until $finish
+    while (!Verilated::gotFinish()) {
+        main_time++;
+        top->clk = ~top->clk & 0x1;
+        top->eval();
+#if VM_TRACE
+        if (tfp) tfp->dump(main_time);
+#endif
+    }
+
+    // Final model cleanup
+    top->final();
+
+    // Close trace if opened
+#if VM_TRACE
+    if (tfp) {
+        tfp->close();
+        tfp = NULL;
+    }
+#endif
+
+    // Destroy model
+    delete top;
+    top = NULL;
+
+    // Fin
+    exit(0);
+}

examples/make_protect_lib/top.v

@@ -0,0 +1,35 @@
+// DESCRIPTION: Verilator: --protect-lib example module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2019 by Todd Strader.
+// SPDX-License-Identifier: CC0-1.0
+
+// See also the EXAMPLE section in the verilator manpage/document.
+module top (input clk);
+
+   integer cyc = 0;
+   logic [31:0] a = 0;
+   logic [31:0] b = 0;
+   logic [31:0] x;
+
+   verilated_secret secret (.a, .b, .x, .clk);
+
+   always @(posedge clk) begin
+      $display("[%0t] cyc=%0d a=%0d b=%0d x=%0d", $time, cyc, a, b, x);
+      cyc <= cyc + 1;
+      if (cyc == 0) begin
+         a <= 5;
+         b <= 7;
+      end else if (cyc == 1) begin
+         a <= 6;
+         b <= 2;
+      end else if (cyc == 2) begin
+         a <= 1;
+         b <= 9;
+      end else if (cyc > 3) begin
+         $display("Done");
+         $finish;
+      end
+   end
+
+endmodule

examples/make_tracing_c/Makefile

@@ -5,10 +5,11 @@
 # This calls the object directory makefile.  That allows the objects to
 # be placed in the "current directory" which simplifies the Makefile.
 #
-# Copyright 2003-2018 by Wilson Snyder. This program is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 #
 ######################################################################
 # Check for sanity to avoid later confusion
@@ -21,7 +22,7 @@ endif
 # Set up variables
 
 # If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
-# package inatall, and verilator is in your path. Otherwise find the
+# package install, and verilator is in your path. Otherwise find the
 # binary relative to $VERILATOR_ROOT (such as when inside the git sources).
 ifeq ($(VERILATOR_ROOT),)
 VERILATOR = verilator
@@ -38,7 +39,7 @@ VERILATOR_FLAGS += -cc --exe
 # Generate makefile dependencies (not shown as complicates the Makefile)
 #VERILATOR_FLAGS += -MMD
 # Optimize
-VERILATOR_FLAGS += -O2 -x-assign 0
+VERILATOR_FLAGS += -Os -x-assign 0
 # Warn abount lint issues; may not want this on less solid designs
 VERILATOR_FLAGS += -Wall
 # Make waveforms
@@ -52,6 +53,9 @@ VERILATOR_FLAGS += --coverage
 # Add this trace to get a backtrace in gdb
 #VERILATOR_FLAGS += --gdbbt
 
+# Input files for Verilator
+VERILATOR_INPUT = -f input.vc top.v sim_main.cpp
+
 ######################################################################
 default: run
 
@@ -61,22 +65,26 @@ run:
 
 	@echo
 	@echo "-- VERILATE ----------------"
-	$(VERILATOR) $(VERILATOR_FLAGS) -f input.vc top.v sim_main.cpp
+	$(VERILATOR) $(VERILATOR_FLAGS) $(VERILATOR_INPUT)
 
 	@echo
-	@echo "-- COMPILE -----------------"
-# To compile, we can either just do what Verilator asks,
-# or call a submakefile where we can override the rules ourselves
-#	$(MAKE) -j 4 -C obj_dir -f Vtop.mk
-	$(MAKE) -j 4 -C obj_dir -f ../Makefile_obj
+	@echo "-- BUILD -------------------"
+# To compile, we can either
+# 1. Pass --build to Verilator by editing VERILATOR_FLAGS above.
+# 2. Or, run the make rules Verilator does:
+#	$(MAKE) -j -C obj_dir -f Vtop.mk
+# 3. Or, call a submakefile where we can override the rules ourselves:
+	$(MAKE) -j -C obj_dir -f ../Makefile_obj
 
 	@echo
 	@echo "-- RUN ---------------------"
+	@rm -rf logs
 	@mkdir -p logs
 	obj_dir/Vtop +trace
 
 	@echo
 	@echo "-- COVERAGE ----------------"
+	@rm -rf logs/annotated
 	$(VERILATOR_COVERAGE) --annotate logs/annotated logs/coverage.dat
 
 	@echo

examples/make_tracing_c/Makefile_obj

@@ -5,10 +5,11 @@
 #
 # This is executed in the object directory, and called by ../Makefile
 #
-# Copyright 2003-2018 by Wilson Snyder. This program is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 #
 #######################################################################
 
@@ -38,7 +39,7 @@ endif
 # SystemC takes minutes to optimize, thus it is off by default.
 OPT_SLOW =
 # Fast path optimizations.  Most time is spent in these classes.
-OPT_FAST = -O2 -fstrict-aliasing
+OPT_FAST = -Os -fstrict-aliasing
 #OPT_FAST = -O
 #OPT_FAST =
 

examples/make_tracing_c/sim_main.cpp

@@ -0,0 +1,106 @@
+// DESCRIPTION: Verilator: Verilog example module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2017 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+//======================================================================
+
+// Include common routines
+#include <verilated.h>
+
+// Include model header, generated from Verilating "top.v"
+#include "Vtop.h"
+
+// Current simulation time (64-bit unsigned)
+vluint64_t main_time = 0;
+// Called by $time in Verilog
+double sc_time_stamp() {
+    return main_time;  // Note does conversion to real, to match SystemC
+}
+
+int main(int argc, char** argv, char** env) {
+    // This is a more complicated example, please also see the simpler examples/make_hello_c.
+
+    // Prevent unused variable warnings
+    if (0 && argc && argv && env) {}
+
+    // Set debug level, 0 is off, 9 is highest presently used
+    // May be overridden by commandArgs
+    Verilated::debug(0);
+
+    // Randomization reset policy
+    // May be overridden by commandArgs
+    Verilated::randReset(2);
+
+    // Verilator must compute traced signals
+    Verilated::traceEverOn(true);
+
+    // Pass arguments so Verilated code can see them, e.g. $value$plusargs
+    // This needs to be called before you create any model
+    Verilated::commandArgs(argc, argv);
+
+    // Create logs/ directory in case we have traces to put under it
+    Verilated::mkdir("logs");
+
+    // Construct the Verilated model, from Vtop.h generated from Verilating "top.v"
+    Vtop* top = new Vtop;  // Or use a const unique_ptr, or the VL_UNIQUE_PTR wrapper
+
+    // Set some inputs
+    top->reset_l = !0;
+    top->clk = 0;
+    top->in_small = 1;
+    top->in_quad = 0x1234;
+    top->in_wide[0] = 0x11111111;
+    top->in_wide[1] = 0x22222222;
+    top->in_wide[2] = 0x3;
+
+    // Simulate until $finish
+    while (!Verilated::gotFinish()) {
+        main_time++;  // Time passes...
+
+        // Toggle a fast (time/2 period) clock
+        top->clk = !top->clk;
+
+        // Toggle control signals on an edge that doesn't correspond
+        // to where the controls are sampled; in this example we do
+        // this only on a negedge of clk, because we know
+        // reset is not sampled there.
+        if (!top->clk) {
+            if (main_time > 1 && main_time < 10) {
+                top->reset_l = !1;  // Assert reset
+            } else {
+                top->reset_l = !0;  // Deassert reset
+            }
+            // Assign some other inputs
+            top->in_quad += 0x12;
+        }
+
+        // Evaluate model
+        // (If you have multiple models being simulated in the same
+        // timestep then instead of eval(), call eval_step() on each, then
+        // eval_end_step() on each.)
+        top->eval();
+
+        // Read outputs
+        VL_PRINTF("[%" VL_PRI64 "d] clk=%x rstl=%x iquad=%" VL_PRI64 "x"
+                  " -> oquad=%" VL_PRI64 "x owide=%x_%08x_%08x\n",
+                  main_time, top->clk, top->reset_l, top->in_quad, top->out_quad, top->out_wide[2],
+                  top->out_wide[1], top->out_wide[0]);
+    }
+
+    // Final model cleanup
+    top->final();
+
+    //  Coverage analysis (since test passed)
+#if VM_COVERAGE
+    Verilated::mkdir("logs");
+    VerilatedCov::write("logs/coverage.dat");
+#endif
+
+    // Destroy model
+    delete top;
+    top = NULL;
+
+    // Fin
+    exit(0);
+}

examples/make_tracing_c/sub.v

@@ -1,31 +1,17 @@
 // DESCRIPTION: Verilator: Verilog Test module
 //
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2003 by Wilson Snyder.
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2003 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
 // ======================================================================
 
 module sub
   (
    input clk,
-   input fastclk,
    input reset_l
    );
 
    // Example counter/flop
-   reg [31:0] count_f;
-   always_ff @ (posedge fastclk) begin
-      if (!reset_l) begin
-         /*AUTORESET*/
-         // Beginning of autoreset for uninitialized flops
-         count_f <= 32'h0;
-         // End of automatics
-      end
-      else begin
-         count_f <= count_f + 1;
-      end
-   end
-
-   // Another example flop
    reg [31:0] count_c;
    always_ff @ (posedge clk) begin
       if (!reset_l) begin
@@ -37,8 +23,6 @@ module sub
       else begin
          count_c <= count_c + 1;
          if (count_c >= 3) begin
-            $display("[%0t] fastclk is %0d times faster than clk\n",
-                     $time, count_f/count_c);
             // This write is a magic value the Makefile uses to make sure the
             // test completes successfully.
             $write("*-* All Finished *-*\n");

examples/make_tracing_c/top.v

@@ -0,0 +1,46 @@
+// DESCRIPTION: Verilator: Verilog example module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2003 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+// ======================================================================
+
+// This is intended to be a complex example of several features, please also
+// see the simpler examples/make_hello_c.
+
+module top
+  (
+   // Declare some signals so we can see how I/O works
+   input              clk,
+   input              reset_l,
+
+   output wire [1:0]  out_small,
+   output wire [39:0] out_quad,
+   output wire [69:0] out_wide,
+   input [1:0]        in_small,
+   input [39:0]       in_quad,
+   input [69:0]       in_wide
+   );
+
+   // Connect up the outputs, using some trivial logic
+   assign out_small = ~reset_l ? '0 : (in_small + 2'b1);
+   assign out_quad  = ~reset_l ? '0 : (in_quad + 40'b1);
+   assign out_wide  = ~reset_l ? '0 : (in_wide + 70'b1);
+
+   // And an example sub module. The submodule will print stuff.
+   sub sub (/*AUTOINST*/
+            // Inputs
+            .clk                        (clk),
+            .reset_l                    (reset_l));
+
+   // Print some stuff as an example
+   initial begin
+      if ($test$plusargs("trace") != 0) begin
+         $display("[%0t] Tracing to logs/vlt_dump.vcd...\n", $time);
+         $dumpfile("logs/vlt_dump.vcd");
+         $dumpvars();
+      end
+      $display("[%0t] Model running...\n", $time);
+   end
+
+endmodule

examples/make_tracing_sc/Makefile

@@ -5,10 +5,11 @@
 # This calls the object directory makefile.  That allows the objects to
 # be placed in the "current directory" which simplifies the Makefile.
 #
-# Copyright 2003-2018 by Wilson Snyder. This program is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 #
 ######################################################################
 # Check for sanity to avoid later confusion
@@ -21,7 +22,7 @@ endif
 # Set up variables
 
 # If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
-# package inatall, and verilator is in your path. Otherwise find the
+# package install, and verilator is in your path. Otherwise find the
 # binary relative to $VERILATOR_ROOT (such as when inside the git sources).
 ifeq ($(VERILATOR_ROOT),)
 VERILATOR = verilator
@@ -38,7 +39,7 @@ VERILATOR_FLAGS += -sc --exe
 # Generate makefile dependencies (not shown as complicates the Makefile)
 #VERILATOR_FLAGS += -MMD
 # Optimize
-VERILATOR_FLAGS += -O2 -x-assign 0
+VERILATOR_FLAGS += -Os -x-assign 0
 # Warn abount lint issues; may not want this on less solid designs
 VERILATOR_FLAGS += -Wall
 # Make waveforms
@@ -52,6 +53,9 @@ VERILATOR_FLAGS += --coverage
 # Add this trace to get a backtrace in gdb
 #VERILATOR_FLAGS += --gdbbt
 
+# Input files for Verilator
+VERILATOR_INPUT = -f input.vc top.v sc_main.cpp
+
 # Check if SC exists via a verilator call (empty if not)
 SYSTEMC_EXISTS := $(shell $(VERILATOR) --getenv SYSTEMC_INCLUDE)
 
@@ -69,22 +73,26 @@ run:
 
 	@echo
 	@echo "-- VERILATE ----------------"
-	$(VERILATOR) $(VERILATOR_FLAGS) -f input.vc top.v sc_main.cpp
+	$(VERILATOR) $(VERILATOR_FLAGS) $(VERILATOR_INPUT)
 
 	@echo
-	@echo "-- COMPILE ----------------="
-# To compile, we can either just do what Verilator asks,
-# or call a submakefile where we can override the rules ourselves
-#	$(MAKE) -j 4 -C obj_dir -f Vtop.mk
-	$(MAKE) -j 4 -C obj_dir -f ../Makefile_obj
+	@echo "-- COMPILE -----------------"
+# To compile, we can either
+# 1. Pass --build to Verilator by editing VERILATOR_FLAGS above.
+# 2. Or, run the make rules Verilator does:
+#	$(MAKE) -j -C obj_dir -f Vtop.mk
+# 3. Or, call a submakefile where we can override the rules ourselves:
+	$(MAKE) -j -C obj_dir -f ../Makefile_obj
 
 	@echo
 	@echo "-- RUN ---------------------"
+	@rm -rf logs
 	@mkdir -p logs
 	obj_dir/Vtop +trace
 
 	@echo
 	@echo "-- COVERAGE ----------------"
+	@rm -rf logs/annotated
 	$(VERILATOR_COVERAGE) --annotate logs/annotated logs/coverage.dat
 
 	@echo
@@ -92,6 +100,7 @@ run:
 	@echo "To see waveforms, open vlt_dump.vcd in a waveform viewer"
 	@echo
 
+
 ######################################################################
 # Other targets
 

examples/make_tracing_sc/Makefile_obj

@@ -5,10 +5,11 @@
 #
 # This is executed in the object directory, and called by ../Makefile
 #
-# Copyright 2003-2018 by Wilson Snyder. This program is free software; you can
-# redistribute it and/or modify it under the terms of either the GNU
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 #
 #######################################################################
 
@@ -46,7 +47,7 @@ endif
 # SystemC takes minutes to optimize, thus it is off by default.
 OPT_SLOW =
 # Fast path optimizations.  Most time is spent in these classes.
-OPT_FAST = -O2 -fstrict-aliasing
+OPT_FAST = -Os -fstrict-aliasing
 #OPT_FAST = -O
 #OPT_FAST =
 

examples/make_tracing_sc/sc_main.cpp

@@ -1,8 +1,9 @@
 // -*- SystemC -*-
 // DESCRIPTION: Verilator Example: Top level main for invoking SystemC model
 //
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2017 by Wilson Snyder.
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2017 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
 //======================================================================
 
 // SystemC global header
@@ -20,36 +21,43 @@
 #include "Vtop.h"
 
 int sc_main(int argc, char* argv[]) {
-    // This is a more complicated example, please also see the simpler examples/hello_world_c.
+    // This is a more complicated example, please also see the simpler examples/make_hello_c.
 
     // Prevent unused variable warnings
     if (0 && argc && argv) {}
-    // Pass arguments so Verilated code can see them, e.g. $value$plusargs
-    Verilated::commandArgs(argc, argv);
 
     // Set debug level, 0 is off, 9 is highest presently used
+    // May be overridden by commandArgs
     Verilated::debug(0);
 
     // Randomization reset policy
+    // May be overridden by commandArgs
     Verilated::randReset(2);
 
+    // Pass arguments so Verilated code can see them, e.g. $value$plusargs
+    // This needs to be called before you create any model
+    Verilated::commandArgs(argc, argv);
+
+    // Create logs/ directory in case we have traces to put under it
+    Verilated::mkdir("logs");
+
     // General logfile
     ios::sync_with_stdio();
 
     // Defaults time
-#if (SYSTEMC_VERSION>20011000)
+#if (SYSTEMC_VERSION > 20011000)
 #else
     sc_time dut(1.0, sc_ns);
     sc_set_default_time_unit(dut);
 #endif
 
     // Define clocks
-#if (SYSTEMC_VERSION>=20070314)
-    sc_clock clk     ("clk",    10,SC_NS, 0.5, 3,SC_NS, true);
-    sc_clock fastclk ("fastclk", 2,SC_NS, 0.5, 2,SC_NS, true);
+#if (SYSTEMC_VERSION >= 20070314)
+    sc_clock clk("clk", 10, SC_NS, 0.5, 3, SC_NS, true);
+    sc_clock fastclk("fastclk", 2, SC_NS, 0.5, 2, SC_NS, true);
 #else
-    sc_clock clk     ("clk",    10, 0.5, 3, true);
-    sc_clock fastclk ("fastclk", 2, 0.5, 2, true);
+    sc_clock clk("clk", 10, 0.5, 3, true);
+    sc_clock fastclk("fastclk", 2, 0.5, 2, true);
 #endif
 
     // Define interconnect
@@ -64,15 +72,15 @@ int sc_main(int argc, char* argv[]) {
     // Construct the Verilated model, from inside Vtop.h
     Vtop* top = new Vtop("top");
     // Attach signals to the model
-    top->clk       (clk);
-    top->fastclk   (fastclk);
-    top->reset_l   (reset_l);
-    top->in_small  (in_small);
-    top->in_quad   (in_quad);
-    top->in_wide   (in_wide);
-    top->out_small (out_small);
-    top->out_quad  (out_quad);
-    top->out_wide  (out_wide);
+    top->clk(clk);
+    top->fastclk(fastclk);
+    top->reset_l(reset_l);
+    top->in_small(in_small);
+    top->in_quad(in_quad);
+    top->in_wide(in_wide);
+    top->out_small(out_small);
+    top->out_quad(out_quad);
+    top->out_wide(out_wide);
 
 #if VM_TRACE
     // Before any evaluation, need to know to calculate those signals only used for tracing
@@ -81,8 +89,8 @@ int sc_main(int argc, char* argv[]) {
 
     // You must do one evaluation before enabling waves, in order to allow
     // SystemC to interconnect everything for testing.
-#if (SYSTEMC_VERSION>=20070314)
-    sc_start(1,SC_NS);
+#if (SYSTEMC_VERSION >= 20070314)
+    sc_start(1, SC_NS);
 #else
     sc_start(1);
 #endif
@@ -92,10 +100,10 @@ int sc_main(int argc, char* argv[]) {
     // and if at run time passed the +trace argument, turn on tracing
     VerilatedVcdSc* tfp = NULL;
     const char* flag = Verilated::commandArgsPlusMatch("trace");
-    if (flag && 0==strcmp(flag, "+trace")) {
+    if (flag && 0 == strcmp(flag, "+trace")) {
         cout << "Enabling waves into logs/vlt_dump.vcd...\n";
         tfp = new VerilatedVcdSc;
-        top->trace(tfp, 99);
+        top->trace(tfp, 99);  // Trace 99 levels of hierarchy
         Verilated::mkdir("logs");
         tfp->open("logs/vlt_dump.vcd");
     }
@@ -110,15 +118,15 @@ int sc_main(int argc, char* argv[]) {
 #endif
 
         // Apply inputs
-        if (VL_TIME_Q() > 1 && VL_TIME_Q() < 10) {
-            reset_l = !1;       // Assert reset
-        } else if (VL_TIME_Q() > 1) {
-            reset_l = !0;       // Deassert reset
+        if (sc_time_stamp() > sc_time(1, SC_NS) && sc_time_stamp() < sc_time(10, SC_NS)) {
+            reset_l = !1;  // Assert reset
+        } else {
+            reset_l = !0;  // Deassert reset
         }
 
         // Simulate 1ns
-#if (SYSTEMC_VERSION>=20070314)
-        sc_start(1,SC_NS);
+#if (SYSTEMC_VERSION >= 20070314)
+        sc_start(1, SC_NS);
 #else
         sc_start(1);
 #endif
@@ -129,7 +137,10 @@ int sc_main(int argc, char* argv[]) {
 
     // Close trace if opened
 #if VM_TRACE
-    if (tfp) { tfp->close(); tfp = NULL; }
+    if (tfp) {
+        tfp->close();
+        tfp = NULL;
+    }
 #endif
 
     //  Coverage analysis (since test passed)
@@ -139,7 +150,8 @@ int sc_main(int argc, char* argv[]) {
 #endif
 
     // Destroy model
-    delete top; top = NULL;
+    delete top;
+    top = NULL;
 
     // Fin
     return 0;

examples/make_tracing_sc/sub.v

@@ -1,7 +1,8 @@
 // DESCRIPTION: Verilator: Verilog Test module
 //
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2003 by Wilson Snyder.
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2003 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
 // ======================================================================
 
 module sub
@@ -49,7 +50,7 @@ module sub
 
    // An example assertion
    always_ff @ (posedge clk) begin
-      AssertionExample: assert (!reset_l || count_c<100);
+      AssertionExample: assert(!reset_l || count_c<100);
    end
 
    // And example coverage analysis

examples/make_tracing_sc/top.v

@@ -1,31 +1,32 @@
 // DESCRIPTION: Verilator: Verilog example module
 //
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2003 by Wilson Snyder.
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2003 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
 // ======================================================================
 
 // This is intended to be a complex example of several features, please also
-// see the simpler examples/hello_world_c.
+// see the simpler examples/make_hello_c.
 
 module top
   (
    // Declare some signals so we can see how I/O works
-   input         clk,
-   input         fastclk,
-   input         reset_l,
+   input              clk,
+   input              fastclk,
+   input              reset_l,
 
-   output [1:0]  out_small,
-   output [39:0] out_quad,
-   output [69:0] out_wide,
-   input [1:0]   in_small,
-   input [39:0]  in_quad,
-   input [69:0]  in_wide
+   output wire [1:0]  out_small,
+   output wire [39:0] out_quad,
+   output wire [69:0] out_wide,
+   input [1:0]        in_small,
+   input [39:0]       in_quad,
+   input [69:0]       in_wide
    );
 
    // Connect up the outputs, using some trivial logic
-   wire [1:0]    out_small = ~reset_l ? '0 : (in_small + 2'b1);
-   wire [39:0]   out_quad  = ~reset_l ? '0 : (in_quad + 40'b1);
-   wire [69:0]   out_wide  = ~reset_l ? '0 : (in_wide + 70'b1);
+   assign out_small = ~reset_l ? '0 : (in_small + 2'b1);
+   assign out_quad  = ~reset_l ? '0 : (in_quad + 40'b1);
+   assign out_wide  = ~reset_l ? '0 : (in_wide + 70'b1);
 
    // And an example sub module. The submodule will print stuff.
    sub sub (/*AUTOINST*/

examples/tracing_c/sim_main.cpp

@@ -1,122 +0,0 @@
-// DESCRIPTION: Verilator: Verilog example module
-//
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2017 by Wilson Snyder.
-//======================================================================
-
-// Include common routines
-#include <verilated.h>
-
-// Include model header, generated from Verilating "top.v"
-#include "Vtop.h"
-
-// If "verilator --trace" is used, include the tracing class
-#if VM_TRACE
-# include <verilated_vcd_c.h>
-#endif
-
-// Current simulation time (64-bit unsigned)
-vluint64_t main_time = 0;
-// Called by $time in Verilog
-double sc_time_stamp() {
-    return main_time;  // Note does conversion to real, to match SystemC
-}
-
-int main(int argc, char** argv, char** env) {
-    // This is a more complicated example, please also see the simpler examples/hello_world_c.
-
-    // Prevent unused variable warnings
-    if (0 && argc && argv && env) {}
-    // Pass arguments so Verilated code can see them, e.g. $value$plusargs
-    Verilated::commandArgs(argc, argv);
-
-    // Set debug level, 0 is off, 9 is highest presently used
-    Verilated::debug(0);
-
-    // Randomization reset policy
-    Verilated::randReset(2);
-
-    // Construct the Verilated model, from Vtop.h generated from Verilating "top.v"
-    Vtop* top = new Vtop; // Or use a const unique_ptr, or the VL_UNIQUE_PTR wrapper
-
-#if VM_TRACE
-    // If verilator was invoked with --trace argument,
-    // and if at run time passed the +trace argument, turn on tracing
-    VerilatedVcdC* tfp = NULL;
-    const char* flag = Verilated::commandArgsPlusMatch("trace");
-    if (flag && 0==strcmp(flag, "+trace")) {
-        Verilated::traceEverOn(true);  // Verilator must compute traced signals
-        VL_PRINTF("Enabling waves into logs/vlt_dump.vcd...\n");
-        tfp = new VerilatedVcdC;
-        top->trace(tfp, 99);  // Trace 99 levels of hierarchy
-        Verilated::mkdir("logs");
-        tfp->open("logs/vlt_dump.vcd");  // Open the dump file
-    }
-#endif
-
-    // Set some inputs
-    top->reset_l = !0;
-    top->fastclk = 0;
-    top->clk = 0;
-    top->in_small = 1;
-    top->in_quad = 0x1234;
-    top->in_wide[0] = 0x11111111;
-    top->in_wide[1] = 0x22222222;
-    top->in_wide[2] = 0x3;
-
-    // Simulate until $finish
-    while (!Verilated::gotFinish()) {
-        main_time++;  // Time passes...
-
-        // Toggle clocks and such
-        top->fastclk = !top->fastclk;
-        if ((main_time % 10) == 3) {
-            top->clk = 1;
-        }
-        if ((main_time % 10) == 8) {
-            top->clk = 0;
-        }
-        if (main_time > 1 && main_time < 10) {
-            top->reset_l = !1;  // Assert reset
-        } else {
-            top->reset_l = !0;  // Deassert reset
-        }
-
-        // Assign some other inputs
-        top->in_quad += 0x12;
-
-        // Evaluate model
-        top->eval();
-
-#if VM_TRACE
-        // Dump trace data for this cycle
-        if (tfp) tfp->dump (main_time);
-#endif
-
-        // Read outputs
-        VL_PRINTF ("[%" VL_PRI64 "d] clk=%x rstl=%x iquad=%" VL_PRI64 "x"
-                   " -> oquad=%" VL_PRI64"x owide=%x_%08x_%08x\n",
-                   main_time, top->clk, top->reset_l, top->in_quad,
-                   top->out_quad, top->out_wide[2], top->out_wide[1], top->out_wide[0]);
-    }
-
-    // Final model cleanup
-    top->final();
-
-    // Close trace if opened
-#if VM_TRACE
-    if (tfp) { tfp->close(); tfp = NULL; }
-#endif
-
-    //  Coverage analysis (since test passed)
-#if VM_COVERAGE
-    Verilated::mkdir("logs");
-    VerilatedCov::write("logs/coverage.dat");
-#endif
-
-    // Destroy model
-    delete top; top = NULL;
-
-    // Fin
-    exit(0);
-}

examples/tracing_c/top.v

@@ -1,42 +0,0 @@
-// DESCRIPTION: Verilator: Verilog example module
-//
-// This file ONLY is placed into the Public Domain, for any use,
-// without warranty, 2003 by Wilson Snyder.
-// ======================================================================
-
-// This is intended to be a complex example of several features, please also
-// see the simpler examples/hello_world_c.
-
-module top
-  (
-   // Declare some signals so we can see how I/O works
-   input         clk,
-   input         fastclk,
-   input         reset_l,
-
-   output [1:0]  out_small,
-   output [39:0] out_quad,
-   output [69:0] out_wide,
-   input [1:0]   in_small,
-   input [39:0]  in_quad,
-   input [69:0]  in_wide
-   );
-
-   // Connect up the outputs, using some trivial logic
-   wire [1:0]    out_small = ~reset_l ? '0 : (in_small + 2'b1);
-   wire [39:0]   out_quad  = ~reset_l ? '0 : (in_quad + 40'b1);
-   wire [69:0]   out_wide  = ~reset_l ? '0 : (in_wide + 70'b1);
-
-   // And an example sub module. The submodule will print stuff.
-   sub sub (/*AUTOINST*/
-            // Inputs
-            .clk                        (clk),
-            .fastclk                    (fastclk),
-            .reset_l                    (reset_l));
-
-   // Print some stuff as an example
-   initial begin
-      $display("[%0t] Model running...\n", $time);
-   end
-
-endmodule

examples/xml_py/.gitignore

@@ -0,0 +1,6 @@
+obj_*
+copied
+*.csv
+*.dot
+*.dmp
+*.pdf

examples/xml_py/Makefile

@@ -0,0 +1,63 @@
+######################################################################
+#
+# DESCRIPTION: Verilator Example: XML tests
+#
+# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+#
+######################################################################
+
+# This makefile is not intended to be useful as an example itself,
+# it is just to run the small example scripts in this directory.
+
+# If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
+# package install, and verilator is in your path. Otherwise find the
+# binary relative to $VERILATOR_ROOT (such as when inside the git sources).
+ifeq ($(VERILATOR_ROOT),)
+VERILATOR = verilator
+else
+export VERILATOR_ROOT
+VERILATOR = $(VERILATOR_ROOT)/bin/verilator
+endif
+
+DOT = dot
+PYTHON = python3
+
+PYTHON_VERSION := $(shell ${PYTHON} --version 2>&1)
+PYTHON_VERSION_FULL := $(wordlist 2,4,$(subst ., ,${PYTHON_VERSION}))
+PYTHON_VERSION_MAJOR := $(word 1,${PYTHON_VERSION_FULL})
+PYTHON_VERSION_MINOR := $(word 2,${PYTHON_VERSION_FULL})
+PYTHON_GE_3_5 := $(shell [ ${PYTHON_VERSION_MAJOR} -eq 3 -a ${PYTHON_VERSION_MINOR} -ge 5 ] && echo true)
+
+ifeq (${PYTHON_GE_3_5},true)
+default: test
+else
+default: python_message
+endif
+
+python_message:
+	@echo "Found Python version ${PYTHON_VERSION}, but require >= 3.5"
+
+test: \
+	test-vl_file_copy \
+	test-vl_hier_graph \
+
+test-vl_file_copy:
+	@echo "-- vl_file_copy example"
+	$(PYTHON) vl_file_copy -odir copied top.v
+	@cmp copied/top.v top.v
+	@cmp copied/sub.v sub.v
+
+test-vl_hier_graph:
+	@echo "-- vl_hier_graph example"
+	$(PYTHON) vl_hier_graph -o graph.dot top.v
+	@echo "Manually run: " $(DOT) -Tpdf -o graph.pdf graph.dot
+
+######################################################################
+
+maintainer-copy::
+clean mostlyclean distclean maintainer-clean::
+	-rm -rf obj_dir *.log *.csv *.dmp *.dot *.vpd *.pdf core copied

examples/xml_py/sub.v

@@ -0,0 +1,18 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2019 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+// ======================================================================
+
+module sub
+  #(parameter type TYPE_t = logic)
+   (
+    input  TYPE_t in,
+    output TYPE_t out
+    );
+
+   // Some simple logic
+   always_comb out = ~ in;
+
+endmodule

examples/xml_py/top.v

@@ -0,0 +1,33 @@
+// DESCRIPTION: Verilator: Verilog example module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2019 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+// ======================================================================
+
+module top
+  (
+   input              clk,
+   input              fastclk,
+   input              reset_l,
+
+   output wire [1:0]  out_small,
+   output wire [39:0] out_quad,
+   output wire [69:0] out_wide,
+   input [1:0]        in_small,
+   input [39:0]       in_quad,
+   input [69:0]       in_wide
+   );
+
+   sub #(.TYPE_t(logic [1:0])) sub_small
+     (.in(in_small),
+      .out(out_small));
+
+   sub #(.TYPE_t(logic [39:0])) sub_quad
+     (.in(in_quad),
+      .out(out_quad));
+
+   sub #(.TYPE_t(logic [69:0])) sub_wide
+     (.in(in_wide),
+      .out(out_wide));
+endmodule

examples/xml_py/vl_file_copy

@@ -0,0 +1,114 @@
+#!/usr/bin/env python3
+# -*- Python -*- See copyright, etc below
+######################################################################
+
+import argparse
+import os
+import re
+import subprocess
+import sys
+import tempfile
+import xml.etree.ElementTree as ET
+from shutil import copy2
+from pprint import pprint,pformat
+
+#######################################################################
+
+class VlFileCopy:
+    def __init__(self,
+                 verilator_args,  # presently all verilator options are passed-thru
+                 # ideally this script would check against options mentioned in help
+                 debug=0,
+                 output_dir='copied'):  # directory name we output file uses
+        self.debug = debug
+
+        xml_temp = tempfile.NamedTemporaryFile()
+
+        args = ['--xml-output', xml_temp.name,
+                '--bbox-sys',  # Parse some stuff can't translate
+                '--bbox-unsup',
+                '--prefix vlxml']  # So we know name of .xml output
+        args += verilator_args
+        self.run_verilator(args)
+        self.tree = ET.parse(xml_temp.name)
+
+        os.makedirs(output_dir, 0o777, True)
+
+        # Find and copy the files
+        root = self.tree.getroot()
+        xfiles = root.find('files')
+        for xfile in xfiles.findall('file'):
+            filename = xfile.get('filename')
+            if not re.match('^<', filename):  # e.g. <built-in>
+                if self.debug:
+                    print("\tcp %s %s" % (filename, output_dir))
+                copy2(filename, output_dir)
+
+    def run_verilator(self, args):
+        """Run Verilator command, check errors"""
+        if os.getenv("VERILATOR_ROOT"):
+            command = os.getenv("VERILATOR_ROOT") + "/bin/verilator"
+        else:
+            command = "verilator"
+        command += ' ' + ' '.join(args)
+        if self.debug:
+            print("\t%s " % command)
+        status = subprocess.call(command, shell=True)
+        if status != 0:
+            raise Exception("Command failed running Verilator with '"+command+"', stopped")
+
+#######################################################################
+
+if __name__=='__main__':
+    parser = argparse.ArgumentParser(
+        allow_abbrev=False,
+        formatter_class=argparse.RawTextHelpFormatter,
+        description=
+"""Example of using Verilator XML output to copy a list of files to an
+output directory (-odir, defaults to 'copied'), e.g. to easily create a
+tarball of the design to pass to others.
+
+Example usage:
+     vl_file_copy -f input.vc top.v -odir mycopy
+     # This will make at least mycopy/top.v
+""",
+        epilog=
+"""All other arguments are pass-thru to Verilator: e.g.:
+
+  +define+<var>=<value>      Set preprocessor define
+  -F <file>                  Parse options from a file, relatively
+  -f <file>                  Parse options from a file
+  -G<name>=<value>           Overwrite toplevel parameter
+  +incdir+<dir>              Directory to search for includes
+  +libext+<ext>+[ext]...     Extensions for finding modules
+  -v <filename>              Verilog library
+  -y <dir>                   Directory to search for modules
+
+This file ONLY is placed under the Creative Commons Public Domain, for
+any use, without warranty, 2019 by Wilson Snyder.
+SPDX-License-Identifier: CC0-1.0
+"""
+    )
+    parser.add_argument('-debug', '--debug',
+                        action='store_const', const=9,
+                        help='enable debug')
+    parser.add_argument('-odir', '--odir',
+                        action='store', metavar='directory', required=True,
+                        help='target output directory')
+    (args, rem) = parser.parse_known_args()
+
+    print("NOTE: vl_file_copy is only an example starting point for writing your own tool.")
+    # That is:
+    # 1. We will accept basic patches
+    # 2. We are not expecting to make this globally useful. (e.g. we don't cleanup obj_dir)
+    # 3. "make install" will not install this.
+    # 4. This has not had production-worthy validation.
+
+    fc = VlFileCopy(output_dir = args.odir,
+                    debug = args.debug,
+                    verilator_args = rem)
+
+######################################################################
+### Local Variables:
+### compile-command: "./vl_file_copy -h ; VERILATOR_ROOT=$V4 ./vl_file_copy +define+thru top.v"
+### End:

examples/xml_py/vl_hier_graph

@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+# -*- Python -*- See copyright, etc below
+######################################################################
+
+import argparse
+import os
+import re
+import subprocess
+import sys
+import tempfile
+import xml.etree.ElementTree as ET
+from shutil import copy2
+from pprint import pprint,pformat
+
+#######################################################################
+
+class VlHierGraph:
+    def __init__(self,
+                 verilator_args,  # presently all verilator options are passed-thru
+                 # ideally this script would check against options mentioned in help
+                 debug=0,
+                 output_filename='graph.dot'):  # output filename
+        self.debug = debug
+        self.next_vertex_number = 0
+        self.name_to_number = {}
+
+        xml_temp = tempfile.NamedTemporaryFile()
+
+        args = ['--xml-output', xml_temp.name,
+                '--bbox-sys',  # Parse some stuff can't translate
+                '--bbox-unsup',
+                '--prefix vlxml']  # So we know name of .xml output
+        args += verilator_args
+        self.run_verilator(args)
+        self.tree = ET.parse(xml_temp.name)
+
+        with open(output_filename, "w") as fh:
+            # For more serious purposes, use the python graphviz package instead
+            fh.write("digraph {\n")
+            fh.write("  dpi=300;\n")
+            fh.write("  order=LR;\n")
+            fh.write("  node [fontsize=8 shape=\"box\" margin=0.01 width=0 height=0]")
+            fh.write("  edge [fontsize=6]")
+            # Find cells
+            root = self.tree.getroot()
+            netlist = root.find('netlist')
+            for module in netlist.findall('module'):
+                # origNames are before parameterization, name if after
+                mod_name = module.get('name')
+                mod_number = self.name_to_vertex_number(mod_name)
+                fh.write("  n%d [label=\"%s\""
+                         % (mod_number, mod_name))
+                if module.get('topModule'):
+                    fh.write(" color=\"red\" rank=1")
+                fh.write("];\n")
+
+                for instance in module.findall('instance'):
+                    inst_name = instance.get('name')
+                    def_name = instance.get('defName')
+                    def_number = self.name_to_vertex_number(def_name)
+                    fh.write("  n%d->n%d [label=\"%s\"];\n"
+                             % (mod_number, def_number, inst_name));
+
+            fh.write("}\n")
+
+    def name_to_vertex_number(self, name):
+        if not name in self.name_to_number:
+            self.next_vertex_number += 1
+            self.name_to_number[name] = self.next_vertex_number
+        return self.name_to_number[name]
+
+    def run_verilator(self, args):
+        """Run Verilator command, check errors"""
+        if os.getenv("VERILATOR_ROOT"):
+            command = os.getenv("VERILATOR_ROOT") + "/bin/verilator"
+        else:
+            command = "verilator"
+        command += ' ' + ' '.join(args)
+        if self.debug:
+            print("\t%s " % command)
+        status = subprocess.call(command, shell=True)
+        if status != 0:
+            raise Exception("Command failed running Verilator with '"+command+"', stopped")
+
+#######################################################################
+
+if __name__=='__main__':
+    parser = argparse.ArgumentParser(
+        allow_abbrev=False,
+        formatter_class=argparse.RawTextHelpFormatter,
+        description=
+"""Example of using Verilator XML output to create a .dot file showing the
+design module hierarchy.
+
+Example usage:
+     vl_hier_graph -f input.vc top.v -o graph.dot
+     dot -Tpdf -o graph.pdf graph.dot
+""",
+        epilog=
+"""All other arguments are pass-thru to Verilator: e.g.:
+
+  +define+<var>=<value>      Set preprocessor define
+  -F <file>                  Parse options from a file, relatively
+  -f <file>                  Parse options from a file
+  -G<name>=<value>           Overwrite toplevel parameter
+  +incdir+<dir>              Directory to search for includes
+  +libext+<ext>+[ext]...     Extensions for finding modules
+  -v <filename>              Verilog library
+  -y <dir>                   Directory to search for modules
+
+This file ONLY is placed under the Creative Commons Public Domain, for
+any use, without warranty, 2019 by Wilson Snyder.
+SPDX-License-Identifier: CC0-1.0
+"""
+    )
+    parser.add_argument('-debug', '--debug',
+                        action='store_const', const=9,
+                        help='enable debug')
+    parser.add_argument('-o', '--o',
+                        action='store', metavar='filename', required=True,
+                        help='output filename')
+    (args, rem) = parser.parse_known_args()
+
+    print("NOTE: vl_hier_graph is only an example starting point for writing your own tool.")
+    # That is:
+    # 1. We will accept basic patches
+    # 2. We are not expecting to make this globally useful. (e.g. we don't cleanup obj_dir)
+    # 3. "make install" will not install this.
+    # 4. This has not had production-worthy validation.
+
+    fc = VlHierGraph(output_filename = args.o,
+                     debug = args.debug,
+                     verilator_args = rem)
+
+######################################################################
+### Local Variables:
+### compile-command: "./vl_hier_graph -h ; VERILATOR_ROOT=$V4 ./vl_hier_graph +define+thru top.v"
+### End:

include/gtkwave/fastlz.c

@@ -22,6 +22,8 @@
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   THE SOFTWARE.
+
+  SPDX-License-Identifier: MIT
 */
 
 #include "fastlz.h"